---
product_id: 13748161
title: "Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter"
brand: "extech"
price: "B/.510"
currency: PAB
in_stock: true
url: https://www.desertcart.com.pa/products/13748161-extech-rh300-digital-psychrometer-humidity-rh-air-temperature-dew-point
store_origin: PA
region: Panama
---

# Humidity range 10% to 90% RH Measures temp -4°F to 122°F Protective twist sensor cap Extech RH300 Digital Psychrometer, Humidity (RH), Air Temperature, Dew Point & Wet Bulb Meter

**Brand:** extech
**Price:** B/.510
**Availability:** ✅ In Stock

## Summary

> 🌟 Stay ahead of the climate curve 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?** B/.510 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/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

- • **Triple-Read Precision:** Simultaneously displays humidity, air temp, and dew point or wet bulb for instant insights.
- • **Field-Ready Durability:** Compact, lightweight design with a unique sensor cap that twists closed to protect your investment on the go.
- • **Smart Power Management:** Auto Power Off and Data Hold features maximize battery life and ease of use during long field sessions.
- • **Versatile Measurement Range:** Accurate readings from -4°F to 122°F and 10% to 90% RH cover diverse environments and professional needs.
- • **Advanced Differential Calculations:** Calculate T1-T2 differential and dew point differences with optional probe for expert-level diagnostics.

## Overview

The Extech RH300 Digital Psychrometer is a compact, professional-grade meter designed for field use, offering simultaneous readings of relative humidity, air temperature, dew point, and wet bulb temperature. It features a unique protective sensor cap, advanced differential temperature calculations with an optional probe, and smart power-saving functions, making it an essential tool for HVAC professionals and environmental managers seeking reliable, on-the-spot atmospheric data.

## 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 | #539,723 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #69 in Humidifier Humidity Meters |
| Brand | Extech |
| Brand Name | Extech |
| Color | Orange |
| Customer Reviews | 4.4 out of 5 stars 61 Reviews |
| Global Trade Identification Number | 00793950443002 |
| Included Components | Digital Psychrometer |
| Item Weight | 0.02 Kilograms |
| Manufacturer | Extech |
| Model | RH300 |
| Mounting Type | Tabletop |
| Operating Humidity | 10% to 90% |
| Part Number | EXTRH300 |
| Smart Home Compatibility | Not Smart Home Compatible |
| Temperature Accuracy | 1 |
| UPC | 793950443002 796841974500 |
| Unit Count | 1.0 Count |
| Upper Temperature Range | 120 Degrees Fahrenheit |
| Voltage | 1.5 Volts (DC) |
| Warranty Description | 1 Year |

## Product Details

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

## 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 Panama*
*Store origin: PA*
*Last updated: 2026-07-24*