---
product_id: 13748161
title: "Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter"
brand: "extech"
price: "$8529"
currency: MXN
in_stock: true
reviews_count: 8
url: https://www.desertcart.mx/products/13748161-extech-rh300-digital-psychrometer-humidity-rh-air-temperature-dew-point
store_origin: MX
region: Mexico
---

# Accurate dew point & wet bulb readings Protective twist sensor cap Simultaneous multi-parameter display Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter

**Brand:** extech
**Price:** $8529
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate your environment game with precision you can trust!

## 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?** $8529 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/13748161-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

- • **Compact Powerhouse:** Lightweight, tabletop design powered by standard AAA batteries—ready wherever you are.
- • **Triple-Read Precision:** View humidity, temperature, and dew point all at once for instant insights.
- • **Built to Protect & Perform:** Unique sensor cap twists closed to safeguard your device during storage and transport.
- • **Wet Bulb Without the Whirl:** Get wet bulb measurements without the hassle of slinging—effortless and accurate.
- • **Differential Temperature Mastery:** Calculate T1-T2 differential with optional probe for advanced environmental analysis.

## Overview

The Extech RH300 Digital Psychrometer delivers simultaneous readings of relative humidity, air temperature, dew point, and wet bulb temperature with high accuracy. Featuring a unique twist-to-close sensor cap for protection and optional probe compatibility for differential temperature calculations, this lightweight, tabletop device powered by AAA batteries is engineered for professionals demanding reliable environmental monitoring.

## Description

Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter

## 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 |
|---------------|-------|
| Color | Orange |
| Brand | Extech |
| Item Weight | 0.02 Kilograms |
| Battery Description | 2 x AAA (1.5V) |
| Mounting Type | Tabletop |
| Operating Humidity | 10% to 90% |
| Upper Temperature Rating | 1.2E+2 Degrees Fahrenheit |
| Voltage | 1.5 Volts (DC) |
| Temperature Accuracy | 1 |
| Manufacturer | Extech |
| UPC | 793950443002 796841974500 |
| Global Trade Identification Number | 00793950443002 |
| Part Number | EXTRH300 |
| Item Weight | 0.704 ounces |
| Product Dimensions | 3.1 x 1.9 x 9 inches |
| Item model number | RH300 |
| Is Discontinued By Manufacturer | No |
| Style | Humidity Meter and Dew Point |
| Pattern | Thermometer |
| Item Package Quantity | 1 |
| Included Components | Digital Psychrometer |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Description Pile | 2 x AAA (1.5V) |
| Warranty Description | 1 Year |

## Product Details

- **Color:** Orange
- **Brand:** Extech
- **Item Weight:** 0.02 Kilograms
- **Battery Description:** 2 x AAA (1.5V)
- **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)

## 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 item have used these types off and on for years
*by G***N on November 15, 2023*

This has always been my go to when i need dew point reading

### ⭐⭐⭐⭐⭐ RH300
*by P***A on September 16, 2015*

Works great. I lost my Extech pocket model so this is a replacement for it. I like the feature for closing off the ports on the sensor tip. I tend to have the instrument in my truck or in a briefcase so this feature is welcomed. The larger display is much easier to read for me.

### ⭐⭐⭐ Cheap Meter works OK
*by T***0 on September 18, 2012*

This hand held device works OK, it will tell you RH and Dew point very well but the temperature is always 8 to 10 degrees lower than actural room temps.If you really need true reading, don't purchase this one spend more cake and buy a better unit.

## 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.mx/products/13748161-extech-rh300-digital-psychrometer-humidity-rh-air-temperature-dew-point](https://www.desertcart.mx/products/13748161-extech-rh300-digital-psychrometer-humidity-rh-air-temperature-dew-point)

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-10*