---
product_id: 2175292
title: "Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD"
brand: "extech"
price: "€ 145.56"
currency: EUR
in_stock: true
reviews_count: 13
category: "Extech"
url: https://www.desertcart.pt/products/2175292-extech-445580-humidity-and-temperature-pen-fast-sensor-dual-lcd
store_origin: PT
region: Portugal
---

# Fast-response sensor Dual LCD for simultaneous readings Compact pen-style design Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD

**Brand:** extech
**Price:** € 145.56
**Availability:** ✅ In Stock

## Summary

> 🌡️ Stay ahead of the curve with instant, on-the-go environmental insights!

## Quick Answers

- **What is this?** Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD by extech
- **How much does it cost?** € 145.56 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/2175292-extech-445580-humidity-and-temperature-pen-fast-sensor-dual-lcd)

## Best For

- extech enthusiasts

## Why This Product

- Trusted extech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual Display Clarity:** View humidity and temperature side-by-side on a bright, easy-to-read LCD 📊
- • **Trend Tracking Memory:** Min/Max memory function captures environmental fluctuations for smarter decisions
- • **Pocket-Sized Portability:** Slim, pen-style form factor fits effortlessly in your toolkit or pocket 📏
- • **Versatile Pro-Grade Tool:** Ideal for HVAC pros, lab techs, and facility managers ensuring optimal air quality & storage
- • **Instant Precision Readings:** Get humidity & temperature data in seconds with a lightning-fast sensor ⚡

## Overview

The Extech 445580 Humidity and Temperature Pen is a professional-grade, pocket-sized meter delivering rapid, accurate indoor humidity and temperature readings via a dual LCD display. Designed for HVAC, lab, and facility professionals, it features a fast-response sensor and min/max memory to track environmental trends. Its compact, durable design ensures portability and reliability for air quality monitoring, storage control, and inspections.

## Description

The Extech 445580 Humidity/Temperature Pen is a compact, high-precision tool designed for fast and reliable indoor environmental monitoring. Engineered for HVAC professionals, inspectors, facility managers, and lab technicians, this pocket-sized meter provides instant readings of both humidity and temperature on a clear dual LCD display. Its responsive sensor ensures accurate real-time results, while the built-in min/max memory helps track fluctuations and verify long-term conditions. Lightweight and easy to carry, the 445580 is ideal for air quality assessments, comfort studies, storage verification, greenhouse monitoring, and workplace inspections. Whether you're validating HVAC performance or ensuring proper environmental control for sensitive materials, this dependable meter delivers professional-grade results in a portable, user-friendly design.

Review: A Gem in a Field of Cheap Toys - I want to preface this review with the caveat that in order to achieve accurate relative humidity readings, this psychrometer will require the use of a 33% and 75% calibration salt kit. While they cost as much as this meter, they at least ensure accuracy, which was NOT achieved through factory calibration. As shown in the review image, the RH% reading is not calibrated we'll out of the box, but that can be expected as calibration can change in storage or shipping. I went through and returned several other psychrometers on desertcart before finally finding this one, which actually worked as described. The entire market is saturated with cheap Chinese clones where a company (sometimes reputable) slaps their name on, or changes the color of, the same generic Chinese psychrometer (often 12 degrees F or more off and unable to be calibrated). This meter, however, is unique in on the market and has the backing of the company that produced it. The calibration procedure with the Extech salt kit is easy. The meter is perfectly sized to fit within their calibration bottles and the directions are clear on how to calibrate both to 33% and 75% relative humidity. The construction of the meter exceed that of the competition as well. While It is still plastic, that plastic feels thicker and more solid than the other models on the market which feel like cheap toys. The meter reacts very quickly to changes in temperature and humidity, possibly sub-second, but does take a good 20 seconds or so to stabilize in a new environment. My goal for the meter was to establish as accurate a baseline reading for Temperature and Relative Humidity as possible for use in calibration many other sensors of varying makes and brands within my home automation system and I can gladly report that the goal has been achieved through this meter.
Review: YEP, THIS ONE WORKS! - Works as it should. Just as accurate as more expensive products

## Features

- FAST HUMIDITY AND TEMPERATURE READINGS – Get quick, reliable measurements with a responsive sensor designed for on-the-spot indoor monitoring, making it perfect for HVAC checks, lab work, storage audits, and facility inspections.
- COMPACT AND TRAVEL-READY DESIGN – Slim, pen-style housing fits easily in a pocket, tool pouch, or bag, giving technicians and inspectors a convenient, portable meter they can carry anywhere for instant environmental checks.
- CLEAR DUAL LCD DISPLAY – Features a bright, easy-to-read dual display showing humidity and temperature at the same time, helping users confirm environmental conditions instantly without switching modes or wasting time.
- MIN/MAX MEMORY FUNCTION – Tracks minimum and maximum humidity and temperature levels, allowing you to identify trends, troubleshoot indoor air issues, and verify conditions over time during inspections or monitoring routines.
- IDEAL FOR AIR QUALITY AND STORAGE CONTROL – Perfect for maintaining proper environmental conditions in offices, greenhouses, labs, warehouses, and sensitive storage areas where stable humidity and temperature are crucial.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00023RVR0 |
| Battery Description | Alkaline |
| Best Sellers Rank | #86,820 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #17 in Humidifier Humidity Meters #91 in Humidifier Accessories |
| Brand | Extech |
| Brand Name | Extech |
| Color | green |
| Customer Reviews | 4.6 out of 5 stars 239 Reviews |
| Global Trade Identification Number | 00793950455807 |
| Included Components | 445580, pocket clip, 2023 button battery |
| Item Dimensions W x H | 1.2"W x 1"H |
| Item Highlight | Fast-response sensor, MIN/MAX memory, pocket hygrometer, HVAC/labs/storage, indoor air monitoring |
| Item Weight | 0.07 kg |
| Lower Temperature Rating | 14 °F |
| LowerTemperature Range | 14 °F |
| Manufacturer | Extech |
| Model | 445580 |
| Mounting Type | Tabletop |
| Number of Items | 1 |
| Operating Humidity | 5% - 95% relative humidity |
| Part Number | 445580 |
| Product Dimensions | 1.2"W x 1"H |
| Temperature Accuracy | 1 degree Celsius |
| Temperature Reading Accuracy | plus_minus_1_point_8_degrees_celsius |
| UPC | 793950455807 013227082940 799891859544 885117593696 705554395052 013161017268 |
| Unit Count | 1 Count |
| Upper Temperature Range | 122 °F |
| Voltage | 3 volts |
| Warranty Description | 1 year |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** Extech
- **Color:** green
- **Item Weight:** 0.07 kg
- **Product Dimensions:** 1.2"W x 1"H

## Images

![Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD - Image 1](https://m.media-amazon.com/images/I/71IN4BwC-6L.jpg)
![Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD - Image 2](https://m.media-amazon.com/images/I/71SrfOT4HEL.jpg)
![Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD - Image 3](https://m.media-amazon.com/images/I/91-uXjGyVVL.jpg)
![Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD - Image 4](https://m.media-amazon.com/images/I/71MeOXoBFjL.jpg)
![Extech 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD - Image 5](https://m.media-amazon.com/images/I/61FMqReX82L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ A Gem in a Field of Cheap Toys
*by M***H on August 10, 2023*

I want to preface this review with the caveat that in order to achieve accurate relative humidity readings, this psychrometer will require the use of a 33% and 75% calibration salt kit. While they cost as much as this meter, they at least ensure accuracy, which was NOT achieved through factory calibration. As shown in the review image, the RH% reading is not calibrated we'll out of the box, but that can be expected as calibration can change in storage or shipping. I went through and returned several other psychrometers on Amazon before finally finding this one, which actually worked as described. The entire market is saturated with cheap Chinese clones where a company (sometimes reputable) slaps their name on, or changes the color of, the same generic Chinese psychrometer (often 12 degrees F or more off and unable to be calibrated). This meter, however, is unique in on the market and has the backing of the company that produced it. The calibration procedure with the Extech salt kit is easy. The meter is perfectly sized to fit within their calibration bottles and the directions are clear on how to calibrate both to 33% and 75% relative humidity. The construction of the meter exceed that of the competition as well. While It is still plastic, that plastic feels thicker and more solid than the other models on the market which feel like cheap toys. The meter reacts very quickly to changes in temperature and humidity, possibly sub-second, but does take a good 20 seconds or so to stabilize in a new environment. My goal for the meter was to establish as accurate a baseline reading for Temperature and Relative Humidity as possible for use in calibration many other sensors of varying makes and brands within my home automation system and I can gladly report that the goal has been achieved through this meter.

### ⭐⭐⭐⭐⭐ YEP, THIS ONE WORKS!
*by T***1 on June 8, 2025*

Works as it should. Just as accurate as more expensive products

### ⭐⭐⭐⭐⭐ One humidity sensor went bad, the other two are still working properly 2
*by D***. on November 10, 2014*

Bought three of these three years ago, One humidity sensor went bad, the other two are still working properly 2. After seeing my initial review, a rep. from Extech has sent me a replacement for the nonworking item. I am amazed, as I have had them for awhile, and it is normal(in my experience) for humidity sensors to fail over time. I will sing their praises now, as I have three fully functioning (and still accurate to 1 degree/percent) humidity and temp. pens. Great fit in pocket, and much more reliable over time than comparable products.

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-09-29*