---
product_id: 294918605
title: "Instruments EXTRH300 Humidity Meter with Dew Point"
brand: "extech"
price: "€ 350.11"
currency: EUR
in_stock: true
url: https://www.desertcart.pt/products/294918605-instruments-extrh300-humidity-meter-with-dew-point
store_origin: PT
region: Portugal
---

# Simultaneous RH, temp & dew point Twist-lock sensor cap for protection 0.1°C resolution temp accuracy Instruments EXTRH300 Humidity Meter with Dew Point

**Brand:** extech
**Price:** € 350.11
**Availability:** ✅ In Stock

## Summary

> 💼 Stay ahead of the curve with precision humidity insights!

## Quick Answers

- **What is this?** Instruments EXTRH300 Humidity Meter with Dew Point by extech
- **How much does it cost?** € 350.11 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/294918605-instruments-extrh300-humidity-meter-with-dew-point)

## 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

- • **Built to Last:** Unique twist-lock sensor cap shields sensitive components during storage and transport.
- • **Triple Data Display:** View humidity, temperature, and dew point simultaneously—no more toggling or guesswork.
- • **Effortless Data Capture:** Data Hold function freezes readings so you never miss a critical measurement.
- • **Battery-Free Reliability:** Operates without batteries, ensuring eco-friendly, hassle-free use anytime, anywhere.
- • **Precision at Your Fingertips:** Switchable °F/°C with ultra-fine 0.1° resolution for exact readings every time.

## Overview

The Extech EXTRH300 is a lightweight, battery-free humidity meter designed for professionals who demand precise environmental data. It simultaneously displays relative humidity, temperature, and dew point with 0.1°C resolution, features a protective twist-lock sensor cap, and includes a Data Hold function for easy reading capture—making it an essential tool for accurate climate monitoring.

## Description

Instruments EXTRH300 Humidity Meter with Dew Point

## Features

- Simultaneous display of percent RH, temperature and dew point or wet bulb or probe temperature
- Wet bulb measurements without slinging
- Unique sensor cap design twists to closed position for protection during storage
- Switchable F/C temperature units with 0.1 Deg. Resolution
- Data Hold freezes current reading on display

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Colour | As shown in the image |
| Brand | Extech |
| Item Weight | 0.02 Kilograms |
| Battery Description | No batteries required |
| Mounting Type | Tabletop |
| Voltage | 1.5 Volts (DC) |
| Manufacturer | Extech Instruments |
| UPC | 793950443002 796841974500 |
| Global Trade Identification Number | 00793950443002 |
| Country of Origin | USA |
| Model number | RH300 |
| Number of Memory Sticks | 1 |
| Item Weight | 20 g |
| Product Dimensions | 7.87 x 4.83 x 22.86 cm; 20 g |
| Item model number | RH300 |
| Item Height | 9 Inches |
| Item Width | 1.9 Inches |
| Included Components | 1 |
| Battery type | No batteries required |
| Are batteries included? | No |

## Product Details

- **Colour:** As shown in the image
- **Brand:** Extech
- **Item Weight:** 0.02 Kilograms
- **Battery Description:** No batteries required
- **Mounting Type:** Tabletop

## Images

![Instruments EXTRH300 Humidity Meter with Dew Point - Image 1](https://m.media-amazon.com/images/I/519NUFqGbhL.jpg)

## Questions & Answers

**Q: Does this come with a case?**
A: No it Doesn’t

**Q: What is the humidity range it can measure?**
A: Hello, Thanks for your question, The humidity range is 10 to 90%RH, the Max resolution is: 0.1%RH and the basic acuracy±3%RH. if you have any questions, feel free to contact our technical support line at 866-477-3687 option 3

**Q: Can i use this for test the % of humidity in food, like mixed corn?**
A: No. You can't use this meter for measure humidity in food. This meter is for ambient temperature, ambient humidity, dew point and other variables. Also, you can use an optional wire probe for measure temperature in food, but not humidity.

## Frequently Bought Together

- Extech EXTRH300 EXTECH RH300 - Humidity Meter with Dew Point
- General Tools MMD4E Digital Moisture Meter, Water Leak Detector, Moisture Tester, Pin Type, Backlit LCD Display With Audible and Visual High-Medium-Low Moisture Content Alerts, Grays

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-04-23*