---
product_id: 552305312
title: "Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm"
price: "€ 127.91"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.pt/products/552305312-quantum-par-meter-for-led-grow-light-full-spectrum-ppfd
store_origin: PT
region: Portugal
---

# 0-5000 μmol/m²/sec PPFD range MAX/MIN/AVG dynamic data logging 400-700nm full spectrum precision Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm

**Price:** € 127.91
**Availability:** ✅ In Stock

## Summary

> 🌿 Illuminate your growth game with precision power!

## Quick Answers

- **What is this?** Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm
- **How much does it cost?** € 127.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/552305312-quantum-par-meter-for-led-grow-light-full-spectrum-ppfd)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dynamic Data Mastery:** Capture and analyze up to 100 readings with MAX, MIN, and AVG stats for smarter cultivation.
- • **Full Spectrum Coverage:** Accurately gauges 400-700nm wavelengths, matching natural photosynthetic light perfectly.
- • **Compact & User-Friendly:** Lightweight design with a large display ensures easy, on-the-go monitoring for pros.
- • **Energy & Growth Optimization:** Fine-tune your grow lights to prevent waste and boost plant health effortlessly.
- • **Precision Photosynthesis Insight:** Measure exact light intensity plants crave for optimal growth.

## Overview

The Quantum PAR Meter is a high-precision light meter designed for professional growers and researchers. It measures Photosynthetic Photon Flux Density (PPFD) within 0-5000 μmol/m²/sec across the 400-700nm spectrum, providing accurate data essential for optimizing plant photosynthesis. Featuring dynamic data logging with MAX, MIN, and AVG functions and storage for 100 readings, it enables detailed light monitoring to enhance plant health and energy efficiency in indoor gardening, greenhouses, and farming.

## Description

Product description PAR meter is a device used to measure the intensity of light in the photosynthetically active range, typically in units of micromoles per square meter per second (μmol/m²/s). These meters are commonly used in the field of horticulture, especially for monitoring and optimizing light conditions for plant growth, particularly for LED grow lights. Advantages of a PAR Meter Accurate Light Measurement : PAR meters provide precise measurements of light intensity in the range that plants use for photosynthesis. Optimizing Growth Conditions : By using a PAR meter, growers can ensure that plants receive the right amount of light for photosynthesis, leading to healthier and more vigorous growth. Adjusting Lighting Setup : PAR meters help growers adjust the distance, intensity, and duration of light exposure from grow lights to meet the specific needs of different plants. Monitoring Light Levels : Users can monitor changes in light intensity over time and adjust growing conditions accordingly to prevent overexposure or underexposure to light. Efficient Resource Utilization : With accurate light measurements, growers can optimize energy consumption and ensure that plants receive the appropriate amount of light for their growth stages. Uses for Buyers Optimizing Indoor Gardens : PAR meters help indoor gardeners ensure that their plants receive the right amount of light for healthy growth, especially when using artificial lighting sources like LED grow lights. Maximizing Crop Yields : By using a PAR meter to fine-tune light levels, growers can maximize crop yields and quality, especially in controlled indoor environments. Diagnostics and Troubleshooting : PAR meters can help identify light-related issues such as light hotspots or insufficient light coverage, allowing growers to make necessary adjustments. Research and Experimentation : Researchers and plant enthusiasts can use PAR meters to conduct experiments, study plant responses to different light conditions, and optimize growing techniques. Educational Purposes : PAR meters are valuable tools for educational purposes, teaching students about the importance of light in plant growth and how to measure and manage light levels effectively. Overall, a PAR meter is a valuable tool for anyone involved in indoor gardening, horticulture, or plant research, offering precise measurements and insights into optimizing light conditions for plant growth and health. Record Up to 100 Measured Values: With its robust data storage capability, the meter has the capacity to record and store up to 100 measured values. Hold Function: The convenient hold function allows you to capture a measurement and hold it on the screen, even after removing the meter from the measurement source.a Low Battery Indicator: Equipped with a low battery indicator, the meter provides a timely alert when battery power is running low. Simple Calibration Function: The meter features a straightforward calibration function that empowers you to ensure accuracy in your measurements. Large Screen Display Featuring a generously sized screen display, this meter offers an enhanced visual experience, allowing you to effortlessly read and interpret measurement values. User-Friendly, Easy to Operate Designed with user convenience in mind, the meter is exceptionally user-friendly. Its intuitive interface and straightforward controls make operation a breeze, even for those who are less experienced with similar devices. Tripod Socket A tripod socket enhances the meter's versatility by enabling secure attachment to a compatible tripod (tripod not included). This feature is beneficial when you require a steady setup for precise measurements, allowing you to avoid potential sources of measurement error caused by instability.

Review: Improved User Manual Below - I purchased APM092 PAR meter from GainExpress.com because they sell it a little cheaper than other vendors carrying this product, but the product is the same regardless of who is selling it. The product is very well made. Solid construction. It feels good in your hand, and it is easy to operate, ONCE YOU UNDERSTAND HOW TO USE IT. It appears to be very accurate judging by how well the PPFD readings matched readings provided by the manufacturer of my hydroponics lighting. There’s a handy 1/4” tripod socket that enables you to attach a selfie stick so that you can reach back and take measurements in far corners of your greenhouse. However, you can’t leave the unit on a tripod to record average light during a period, because the unit automatically shuts off after 3 minutes when no buttons are pressed. If there is any weakness it is the user guide, obviously written by someone in China, which fails to explain a some important concepts. To help other purchasers I’ll provide an improved Users Guide below: APM092 PAR USERS GUIDE ON/OFF: Pressing the POWER button turns the unit on. Pressing and holding the POWER button for 3 or more seconds turns the unit off. Turning the unit off, clears the dynamic measurement buffer. 4 MODES: 1) AVE: Measures PPFD every second and reports the average measurement. 2) REC: Measures PPFD every second and reports the last index of data logged. When REC is blinking and HOLD is pressed, you can cycle through measurements stored in the data log. 3) CAL: Zero-point calibration. 4) RES: Reset the unit and clear the data log. When you first turn the unit on, it starts in AVE mode where the meter takes a PFFD measurement every second. This enables you to immediately move the meter over an area to determine the average PPFD. Press the MODE button to cycle through the other modes: AVE > REC > CAL > RES. When moving to REC, CAL, or RES these modes will begin to blink after a brief pause When REC, CAL or RES are blinking you can activate these modes by pressing HOLD. AVE does not blink but indicates that you have returned to taking dynamic measurements, once a second. 3 TYPES OF MEASUREMENTS: 1) DYNAMIC MEASUREMENTS: As you move the meter over an area, dynamic measurements are taken every second. Dynamic measurements continue to be made until you either press HOLD or turn the unit off. Dynamic measurements are stored in an internal buffer and used to report AVE (average), MAX (maximum), and MIN (minimum) dynamic measurements. AVE, MAX, and MIN do NOT include measurements stored in the data log. Turning the unit off clears the dynamic buffer and resets AVE, MAX and MIN values. (see GETTING AVE, MAX, MIN below). 2) A HOLD MEASUREMENT: this is the last dynamic measurement at the time the HOLD button was pressed. When HOLD is pressed, the word “HOLD” is displayed, and additional dynamic measurements are no longer made. To return to dynamic measurements taken every second, press the HOLD button a second time. 3) LOGGED MEASUREMENTS: Up to 100 measurements may be stored in a data log at indexes 001 through 100. To log any dynamic measurement, simply press the UP/LOG button. While in REC mode, the index of the last measurement logged is shown at the top center of the display to the right of REC. Until you log your first measurement, this shows 000. After logging your first dynamic measurement, this changes to 001, meaning that your last logged measurement was stored at index 001. When you press UP/LOG again to store a second measurement, you’ll see 002 displayed and so on. This makes it easy to see how many measurements you’ve previously logged. There is no way to transfer these measurements to your phone or a computer, but you can cycle back through the data log and enter these measurements in a spreadsheet by hand. (see VIEWING LOGGED MEASUREMENTS below). GETTING AVE, MAX, MIN When you first turn the unit on, it enters AVE (average) mode. It immediately begins taking dynamic measurements, once every second, and storing these measurements in a dynamic buffer (NOT to be confused with the data log storing 100 readings). This makes it easy to measure the average PPFD. Simply turn the unit on and move it over a particular area, allowing the meter to take measurements once a second. You will see a large number in the center of the screen showing the current measurement, and a smaller number at the top center of the display to the right of the word “AVE” showing the average of the measurements in the dynamic buffer. To see the MAX and MIN measurements in the dynamic buffer, press the Down button to cycle between AVE > MAX > MIN > REC. For AVE, MAX, and MIN these values will be shown as smaller numbers at the top center of the display to the right of AVE, MAX, or MIN, respectively. When REC is shown, the number at the top center of the display is the index of the last measurement stored in the data log. In every case, the large number at the center of the display is the last current dynamic measurement or the last measurement at the time the HOLD button was pressed. IMPORTANT: the AVE, MAX, and MIN values ONLY reflect the measurements stored in the dynamic buffer and do NOT include measurements stored in the data log. Every time you turn the meter off (by holding the POWER button for 3 or more seconds) the dynamic buffer is cleared, and the AVE, MAX, and MIN values are reset. Turning the unit off does NOT erase the measurements stored in the data log. You can use the HOLD button to control when dynamic measurements are recorded. For example, suppose you are a hydroponics farmer and want to measure the average PPFD for microgreen trays in different parts of your green house. You can turn the unit on and move the meter over the first tray to capture multiple measurements, and then press HOLD to stop taking measurements. Then you walk to the second tray and press HOLD again to reactivate dynamic measurements. Then you would move your PAR meter over the second tray for several seconds to capture several measurements. Next press HOLD to again stop taking dynamic measurements. Walk to the third tray and press HOLD again to reactivate dynamic measurements and so on. Since no measurements are taken while HOLD is displayed, when you walk between trays, no measurements are taken. As a result, the AVE, MAX, and MIN values only apply to the light over the trays you measured. LOGGING MEASUREMENTS To store the current measurement in the data log, simply press the UP/LOG button. This works no matter what mode you are in. The only time pressing the UP/LOG button doesn’t store a measurement is when you activate CAL (Zero-point calibration) or RES (reset) modes by pressing HOLD when CAL or RES are blinking. In this case, both the DOWN and UP/LOG buttons toggle the word displayed from “no” to “YES” to allow you to calibrate the meter or reset the data log, respectively. Unlike measurements in the dynamic buffer, measurements stored in the data log are not cleared when you turn the unit off. To clear the data log, you press the MODE button until the RES (reset) mode is displayed. After a brief pause, RES will start blinking and you press HOLD to display “no”. Then you can use either the DOWN or UP/LOG buttons to toggle between “no” and “YES”. If you press HOLD a second time while “no” is displayed, nothing happens, and you simply return to whatever mode you were in prior to pressing the MODE button. If you press HOLD a second time while “YES” is displayed, your PAR meter will be reset, and the data log will be immediately cleared. VIEWING LOGGED MEASUREMENTS The data log can store up to 100 measurements at indexes 1 through 100. The last 4 logged measurements stored in the data log are shown in a vertical column on the left of the display. To see additional logged measurements, press the MODE button until REC is displayed. After a brief delay the word REC will blink. Next, press the HOLD. This results in index 001 blinking at the top center of the display to the right of REC and the measurement stored at index 001 to be shown in the center of the display. You can then use the DOWN and UP/LOG buttons to cycle through the data log with the index blinking and the measurement at that index shown in the center of the display. If no measurement has been stored at the current blinking index, horizontal dashes will be shown. The measurements stored in the data log cannot be transferred to your mobile device or to a computer. However, as you cycle through the data log you can record these measurements manually in a spreadsheet. ZERO POINT CALIBRATION Press the MODE button until CAL is shown. After a brief pause CAL will start blinking. Pressing HOLD will display the word “no”. Use either the DOWN or UP/LOG buttons to toggle between “no” and “YES”. While “YES” is displayed, cover the light sensor to block all light and press HOLD a second time. If the device is properly calibrated the word “PASS” will be displayed. CLEARING LOGGED MEASUREMENTS To clear the data log, press the MODE button until RES (reset) is display. After a brief pause, RES will begin blinking. Now, press HOLD. This will display the word “no” in the display. Pressing either the DOWN or UP/LOG buttons will toggle the word “no” to “YES”. Pressing HOLD a second time while “YES” is displayed will reset your meter and clear the data log. Pressing HOLD a second time while “no” is displayed will do nothing and cancel the reset.
Review: Good meter for the price - The Quantum PAR Meter is a solid piece of gear for anyone serious about dialing in their grow light setup. Build quality is excellent, feels durable and well-made, like it’ll hold up in a working environment. Functionally, it does what it’s supposed to: gives accurate PPFD readings across full-spectrum LED lights, which is key for optimizing plant growth. I’ve found the sensor to be responsive and consistent, and while it doesn’t have fancy features like wireless logging, it’s reliable and gets the job done. The interface is simple enough to use, even for someone new to PAR measurements, though I do wish the screen was backlit for better visibility in darker grow tents. Valuewise, it’s not the cheapest option out there, but you’re paying for precision and durability. For growers who care about getting the most out of their lighting, it’s worth the investment. The display is readable under normal conditions, but in low light or under intense LEDs, it can be a little hard to see. Still, the meter gives you the data you need to make informed adjustments, and that’s what counts. Overall, it’s a dependable tool that adds real value to any grow operation.

## Features

- PAR Measurement: Measures Photosynthetic Photon Flux Density within a range of 0 to 5000 μmol/m²/sec; across 400±10nm to 700±10nm wavelengths; Features a large display for easy reading; offering MAX/MIN/AVG data functions for comprehensive analysis`
- Dynamic Measurements: This mode continuously records measurements as you scan an area until you hold or power off; AVE (average); MAX (maximum) and MIN (minimum) values are calculated from these dynamic readings; Data is stored internally for analysis. Enables the storage of up to 100 measured values
- Advantages of a PAR Meter: Accurate Light Measurement: Quantum PPFD sensor provide precise measurements of light intensity in the range that plants use for photosynthesis. By using a PAR meter, growers can ensure that plants receive the right amount of light for photosynthesis, leading to healthier and more vigorous growth
- Monitoring Light Levels: Users can monitor changes in light intensity over time and adjust growing conditions accordingly to prevent overexposure or underexposure to light. With accurate light measurements, growers can optimize energy consumption and ensure that plants receive the appropriate amount of light for their growth stages
- PAR meter is a valuable tool for anyone involved in indoor gardening, horticulture, or plant research, offering precise measurements and insights into optimizing light conditions for plant growth and health

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #199,478 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #69 in Lab Photometers & Light Meters |
| Customer Reviews | 4.6 out of 5 stars 95 Reviews |

## Images

![Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm - Image 1](https://m.media-amazon.com/images/I/61n3p2qgztL.jpg)
![Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm - Image 2](https://m.media-amazon.com/images/I/81jgwQD1UNL.jpg)
![Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm - Image 3](https://m.media-amazon.com/images/I/51DXoMch4VL.jpg)
![Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm - Image 4](https://m.media-amazon.com/images/I/71GDch1k-jL.jpg)
![Quantum PAR Meter for LED Grow Light Full Spectrum PPFD Meter High Precision Quantum Sensor, Light Meter for Plants, Greenhouse and Farming Lux Meter Tester 400-700nm - Image 5](https://m.media-amazon.com/images/I/61atTgQajwL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Improved User Manual Below
*by M***N on March 11, 2024*

I purchased APM092 PAR meter from GainExpress.com because they sell it a little cheaper than other vendors carrying this product, but the product is the same regardless of who is selling it. The product is very well made. Solid construction. It feels good in your hand, and it is easy to operate, ONCE YOU UNDERSTAND HOW TO USE IT. It appears to be very accurate judging by how well the PPFD readings matched readings provided by the manufacturer of my hydroponics lighting. There’s a handy 1/4” tripod socket that enables you to attach a selfie stick so that you can reach back and take measurements in far corners of your greenhouse. However, you can’t leave the unit on a tripod to record average light during a period, because the unit automatically shuts off after 3 minutes when no buttons are pressed. If there is any weakness it is the user guide, obviously written by someone in China, which fails to explain a some important concepts. To help other purchasers I’ll provide an improved Users Guide below: APM092 PAR USERS GUIDE ON/OFF: Pressing the POWER button turns the unit on. Pressing and holding the POWER button for 3 or more seconds turns the unit off. Turning the unit off, clears the dynamic measurement buffer. 4 MODES: 1) AVE: Measures PPFD every second and reports the average measurement. 2) REC: Measures PPFD every second and reports the last index of data logged. When REC is blinking and HOLD is pressed, you can cycle through measurements stored in the data log. 3) CAL: Zero-point calibration. 4) RES: Reset the unit and clear the data log. When you first turn the unit on, it starts in AVE mode where the meter takes a PFFD measurement every second. This enables you to immediately move the meter over an area to determine the average PPFD. Press the MODE button to cycle through the other modes: AVE > REC > CAL > RES. When moving to REC, CAL, or RES these modes will begin to blink after a brief pause When REC, CAL or RES are blinking you can activate these modes by pressing HOLD. AVE does not blink but indicates that you have returned to taking dynamic measurements, once a second. 3 TYPES OF MEASUREMENTS: 1) DYNAMIC MEASUREMENTS: As you move the meter over an area, dynamic measurements are taken every second. Dynamic measurements continue to be made until you either press HOLD or turn the unit off. Dynamic measurements are stored in an internal buffer and used to report AVE (average), MAX (maximum), and MIN (minimum) dynamic measurements. AVE, MAX, and MIN do NOT include measurements stored in the data log. Turning the unit off clears the dynamic buffer and resets AVE, MAX and MIN values. (see GETTING AVE, MAX, MIN below). 2) A HOLD MEASUREMENT: this is the last dynamic measurement at the time the HOLD button was pressed. When HOLD is pressed, the word “HOLD” is displayed, and additional dynamic measurements are no longer made. To return to dynamic measurements taken every second, press the HOLD button a second time. 3) LOGGED MEASUREMENTS: Up to 100 measurements may be stored in a data log at indexes 001 through 100. To log any dynamic measurement, simply press the UP/LOG button. While in REC mode, the index of the last measurement logged is shown at the top center of the display to the right of REC. Until you log your first measurement, this shows 000. After logging your first dynamic measurement, this changes to 001, meaning that your last logged measurement was stored at index 001. When you press UP/LOG again to store a second measurement, you’ll see 002 displayed and so on. This makes it easy to see how many measurements you’ve previously logged. There is no way to transfer these measurements to your phone or a computer, but you can cycle back through the data log and enter these measurements in a spreadsheet by hand. (see VIEWING LOGGED MEASUREMENTS below). GETTING AVE, MAX, MIN When you first turn the unit on, it enters AVE (average) mode. It immediately begins taking dynamic measurements, once every second, and storing these measurements in a dynamic buffer (NOT to be confused with the data log storing 100 readings). This makes it easy to measure the average PPFD. Simply turn the unit on and move it over a particular area, allowing the meter to take measurements once a second. You will see a large number in the center of the screen showing the current measurement, and a smaller number at the top center of the display to the right of the word “AVE” showing the average of the measurements in the dynamic buffer. To see the MAX and MIN measurements in the dynamic buffer, press the Down button to cycle between AVE > MAX > MIN > REC. For AVE, MAX, and MIN these values will be shown as smaller numbers at the top center of the display to the right of AVE, MAX, or MIN, respectively. When REC is shown, the number at the top center of the display is the index of the last measurement stored in the data log. In every case, the large number at the center of the display is the last current dynamic measurement or the last measurement at the time the HOLD button was pressed. IMPORTANT: the AVE, MAX, and MIN values ONLY reflect the measurements stored in the dynamic buffer and do NOT include measurements stored in the data log. Every time you turn the meter off (by holding the POWER button for 3 or more seconds) the dynamic buffer is cleared, and the AVE, MAX, and MIN values are reset. Turning the unit off does NOT erase the measurements stored in the data log. You can use the HOLD button to control when dynamic measurements are recorded. For example, suppose you are a hydroponics farmer and want to measure the average PPFD for microgreen trays in different parts of your green house. You can turn the unit on and move the meter over the first tray to capture multiple measurements, and then press HOLD to stop taking measurements. Then you walk to the second tray and press HOLD again to reactivate dynamic measurements. Then you would move your PAR meter over the second tray for several seconds to capture several measurements. Next press HOLD to again stop taking dynamic measurements. Walk to the third tray and press HOLD again to reactivate dynamic measurements and so on. Since no measurements are taken while HOLD is displayed, when you walk between trays, no measurements are taken. As a result, the AVE, MAX, and MIN values only apply to the light over the trays you measured. LOGGING MEASUREMENTS To store the current measurement in the data log, simply press the UP/LOG button. This works no matter what mode you are in. The only time pressing the UP/LOG button doesn’t store a measurement is when you activate CAL (Zero-point calibration) or RES (reset) modes by pressing HOLD when CAL or RES are blinking. In this case, both the DOWN and UP/LOG buttons toggle the word displayed from “no” to “YES” to allow you to calibrate the meter or reset the data log, respectively. Unlike measurements in the dynamic buffer, measurements stored in the data log are not cleared when you turn the unit off. To clear the data log, you press the MODE button until the RES (reset) mode is displayed. After a brief pause, RES will start blinking and you press HOLD to display “no”. Then you can use either the DOWN or UP/LOG buttons to toggle between “no” and “YES”. If you press HOLD a second time while “no” is displayed, nothing happens, and you simply return to whatever mode you were in prior to pressing the MODE button. If you press HOLD a second time while “YES” is displayed, your PAR meter will be reset, and the data log will be immediately cleared. VIEWING LOGGED MEASUREMENTS The data log can store up to 100 measurements at indexes 1 through 100. The last 4 logged measurements stored in the data log are shown in a vertical column on the left of the display. To see additional logged measurements, press the MODE button until REC is displayed. After a brief delay the word REC will blink. Next, press the HOLD. This results in index 001 blinking at the top center of the display to the right of REC and the measurement stored at index 001 to be shown in the center of the display. You can then use the DOWN and UP/LOG buttons to cycle through the data log with the index blinking and the measurement at that index shown in the center of the display. If no measurement has been stored at the current blinking index, horizontal dashes will be shown. The measurements stored in the data log cannot be transferred to your mobile device or to a computer. However, as you cycle through the data log you can record these measurements manually in a spreadsheet. ZERO POINT CALIBRATION Press the MODE button until CAL is shown. After a brief pause CAL will start blinking. Pressing HOLD will display the word “no”. Use either the DOWN or UP/LOG buttons to toggle between “no” and “YES”. While “YES” is displayed, cover the light sensor to block all light and press HOLD a second time. If the device is properly calibrated the word “PASS” will be displayed. CLEARING LOGGED MEASUREMENTS To clear the data log, press the MODE button until RES (reset) is display. After a brief pause, RES will begin blinking. Now, press HOLD. This will display the word “no” in the display. Pressing either the DOWN or UP/LOG buttons will toggle the word “no” to “YES”. Pressing HOLD a second time while “YES” is displayed will reset your meter and clear the data log. Pressing HOLD a second time while “no” is displayed will do nothing and cancel the reset.

### ⭐⭐⭐⭐⭐ Good meter for the price
*by J***. on September 26, 2025*

The Quantum PAR Meter is a solid piece of gear for anyone serious about dialing in their grow light setup. Build quality is excellent, feels durable and well-made, like it’ll hold up in a working environment. Functionally, it does what it’s supposed to: gives accurate PPFD readings across full-spectrum LED lights, which is key for optimizing plant growth. I’ve found the sensor to be responsive and consistent, and while it doesn’t have fancy features like wireless logging, it’s reliable and gets the job done. The interface is simple enough to use, even for someone new to PAR measurements, though I do wish the screen was backlit for better visibility in darker grow tents. Valuewise, it’s not the cheapest option out there, but you’re paying for precision and durability. For growers who care about getting the most out of their lighting, it’s worth the investment. The display is readable under normal conditions, but in low light or under intense LEDs, it can be a little hard to see. Still, the meter gives you the data you need to make informed adjustments, and that’s what counts. Overall, it’s a dependable tool that adds real value to any grow operation.

### ⭐⭐⭐⭐⭐ PPFD on fleek
*by G***N on October 8, 2025*

So far no complaints. Very easy to use and understand. Also very easy to calibrate, and helps me dial in my ppfd for my "tomatoes". 😁

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*Last updated: 2026-05-12*