---
product_id: 48460269
title: "Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter"
brand: "extech"
price: "€ 363.76"
currency: EUR
in_stock: true
reviews_count: 5
category: "Extech"
url: https://www.desertcart.com.cy/products/48460269-extech-rh300-digital-psychrometer-humidity-rh-air-temperature-dew-point
store_origin: CY
region: Cyprus
---

# T1-T2 differential calculation Protective twist sensor cap Simultaneous multi-parameter display Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter

**Brand:** extech
**Price:** € 363.76
**Availability:** ✅ In Stock

## Summary

> 🌟 Stay ahead of the climate curve with Extech RH300 – precision you can trust, wherever you go!

## Quick Answers

- **What is this?** Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter by extech
- **How much does it cost?** € 363.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/48460269-extech-rh300-digital-psychrometer-humidity-rh-air-temperature-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

- • **Rugged & Ready:** Unique sensor cap twists closed to shield your device during transport and storage.
- • **Differential Mastery:** Calculate temperature differentials with optional probe for advanced environmental analysis.
- • **Triple-Read Precision:** View humidity, air temp, and dew point or wet bulb all at once for instant insights.
- • **Smart Power Management:** Auto power off and data hold features maximize battery life and usability in the field.
- • **Field-Ready Compactness:** Lightweight and portable design fits perfectly in your toolkit for on-the-go professionals.

## Overview

The Extech RH300 Digital Psychrometer is a compact, professional-grade meter designed for field use, simultaneously measuring relative humidity, air temperature, dew point, and wet bulb temperature. It features advanced calculations like T1-T2 differential with an optional probe, a protective twist sensor cap, and smart power-saving functions, making it an essential tool for precise environmental monitoring.

## Description

The RH300 is a compact meter that is ideal for field applications. Simultaneously displays relative humidity (10 to 90 percent RH), air temperature (-4 to 122 degrees F /-20 to 50 degrees C) and dew point (-90.4 to 122 degrees F /-68.0 to 49. 9 degrees C) or wet bulb (-6.9 to 122 degrees F /-21.6 to 49.9 degrees C). Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890), and T2 minus dew point. Compact meter is well-suited for field applications. Unique sensor cap closes to protect to protect meter during storage. Advanced features include Data Hold, selectable Auto Power Off, and MAX/MIN/Average reading.

Review: Good value.
Review: Hand held vochtigheidsmeter Extech RH300 - Kan alleer maar gekalibreerd worden mits kit RH 305 te gebruiken of zelf gemaakt equivalent RH 33% en RH57% ijkstandaarden. De fabrieksijking is corect. Goed toestel voor weinig geld. Goede technische ondersteuning vanuit VS.

## Features

- Extech RH300 humidity meter with dew point
- Simultaneous display of %RH, temperature and dew point or wet bulb or probe temperature
- Wet bulb measurements without slinging
- Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890) and T-2 dew point
- Unique sensor cap design twists to closed position for protection during storage

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BF5400 |
| Battery Description | 2 x AAA (1.5V) batteries |
| Battery description | 2 x AAA (1.5V) batteries |
| Best Sellers Rank | 796,665 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,491 in Multi Testers |
| Brand | Extech |
| Colour | Orange |
| Country Of Origin | China |
| Customer Reviews | 4.3 out of 5 stars 57 Reviews |
| Global Trade Identification Number | 00793950443002 |
| Included Components | Digital Psychrometer |
| Item Weight | 0.02 Kilograms |
| Item weight | 0.02 Kilograms |
| Manufacturer | Extech |
| Mounting Type | Tabletop |
| Mounting type | Tabletop |
| Operating Humidity | 10% to 90% |
| Operating humidity | 10% to 90% |
| Temperature Accuracy | +1°C |
| UPC | 793950443002 796841974500 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 122 Degrees Fahrenheit |
| Voltage | 1.5 Volts (DC) |

## Product Details

- **Colour:** Orange
- **Brand:** Extech
- **Item weight:** 0.02 Kilograms
- **Battery description:** 2 x AAA (1.5V) batteries
- **Mounting type:** Tabletop

## Images

![Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter - Image 1](https://m.media-amazon.com/images/I/519NUFqGbhL.jpg)
![Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter - Image 2](https://m.media-amazon.com/images/I/71bG5wwyC7L.jpg)
![Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter - Image 3](https://m.media-amazon.com/images/I/21WYXf7csmL.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good value.
*by A***R on 27 September 2025*



### ⭐⭐⭐⭐ Hand held vochtigheidsmeter Extech RH300
*by E***S on 9 June 2025*

Kan alleer maar gekalibreerd worden mits kit RH 305 te gebruiken of zelf gemaakt equivalent RH 33% en RH57% ijkstandaarden. De fabrieksijking is corect. Goed toestel voor weinig geld. Goede technische ondersteuning vanuit VS.

### ⭐⭐⭐⭐⭐ Works well
*by T***E on 10 May 2018*



## Frequently Bought Together

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-31*