---
product_id: 13748161
title: "Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb"
brand: "extech"
price: "1734 kr"
currency: DKK
in_stock: true
category: "Extech"
url: https://www.desertcart.dk/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb
store_origin: DK
region: Denmark
---

# Humidity range 10-90% RH Dew point & wet bulb readings Measures temp -4 to 122°F Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb

**Brand:** extech
**Price:** 1734 kr
**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, Temp, Dew Point, Wet Bulb by extech
- **How much does it cost?** 1734 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb)

## 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

- • **Trusted Accuracy:** ±1°F temperature accuracy ensures reliable readings for critical decisions.
- • **Triple-Read Precision:** Simultaneously track humidity, air temp, and dew point or wet bulb for comprehensive environmental insight.
- • **Field-Ready Durability:** Compact design with twist-to-close sensor cap protects your investment on the go.
- • **Smart Power Management:** Auto power off and data hold features maximize battery life and ease of use.
- • **Advanced Differential Calculations:** Calculate T1-T2 temperature differentials with optional probe for pinpoint accuracy.

## Overview

The Extech RH300 Digital Psychrometer is a compact, field-ready meter that simultaneously measures relative humidity (10-90% RH), air temperature (-4 to 122°F), dew point, and wet bulb temperatures. Featuring a unique twist-to-close sensor cap for protection, it supports advanced calculations like T1-T2 differentials with an optional probe. Designed for professionals needing reliable, accurate environmental data, it includes smart features like data hold, auto power off, and max/min/average readings, all powered by 2 AAA batteries.

## 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.

## 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) |
| Best Sellers Rank | #439,428 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #48 in Humidifier Humidity Meters |
| Brand Name | Extech |
| Color | Orange |
| Customer Reviews | 4.4 4.4 out of 5 stars (61) |
| Global Trade Identification Number | 00793950443002 |
| Included Components | Digital Psychrometer |
| Item Highlight | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap |
| Item Weight | 0.02 kg |
| Manufacturer | Extech |
| Model | RH300 |
| Mounting Type | Tabletop |
| Number of Items | 1 |
| Number of Packs | 1 |
| Operating Humidity | 10% to 90% |
| Part Number | EXTRH300 |
| Temperature Accuracy | 1 |
| UPC | 793950443002 796841974500 |
| Unit Count | 1 Count |
| Upper Temperature Range | 120 °F |
| Voltage | 1.5 volts_of_direct_current |
| Warranty Description | 1 Year |

## Product Details

- **Battery Description:** 2 x AAA (1.5V)
- **Brand:** Extech
- **Color:** Orange
- **Item Weight:** 0.02 kg
- **Mounting Type:** Tabletop

## Images

![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb - Image 1](https://m.media-amazon.com/images/I/519NUFqGbhL.jpg)
![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb - Image 2](https://m.media-amazon.com/images/I/31OlVduhCoL.jpg)
![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb - Image 3](https://m.media-amazon.com/images/I/41HKxS3RVaL.jpg)
![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb - Image 4](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.

## 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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**Shop now:** [https://www.desertcart.dk/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb](https://www.desertcart.dk/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-09-16*