---
product_id: 13748161
title: "Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap"
brand: "extech"
price: "₩442971"
currency: KRW
in_stock: true
url: https://www.desertcart.kr/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb
store_origin: KR
region: South Korea
---

# Humidity 10-90% RH Twist sensor cap for protection Temp range -4 to 122°F Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap

**Brand:** extech
**Price:** ₩442971
**Availability:** ✅ In Stock

## Summary

> 🌟 Stay ahead of the climate curve with Extech RH300 – your pocket-sized environmental oracle!

## Quick Answers

- **What is this?** Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap by extech
- **How much does it cost?** ₩442971 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/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

- • **Smart Sensor Shield:** Unique twist-to-close sensor cap protects your device on the go—no more damaged sensors.
- • **User-Centric Design:** Compact, lightweight, with Data Hold, Auto Power Off, and MAX/MIN/Average readings for effortless use.
- • **Triple Readout Power:** Simultaneously view humidity, air temp, and dew point or wet bulb for instant insights.
- • **Precision Field Ready:** Accurate measurements with ±1°F temp accuracy and wide operating humidity range (10-90%).
- • **Advanced Differential Calculations:** Calculate T1-T2 differential with optional TP890 probe for professional-grade diagnostics.

## Overview

The Extech RH300 Digital Psychrometer is a compact, field-ready device that simultaneously measures relative humidity (10-90%), air temperature (-4 to 122°F), and dew point or wet bulb temperature. Featuring a unique twist sensor cap for protection, it supports advanced T1-T2 differential calculations with an optional probe, making it ideal for professionals needing precise environmental data on the go.

## 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 | #648,496 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #64 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 Weight | 0.02 kg |
| Manufacturer | Extech |
| Model | RH300 |
| Mounting Type | Tabletop |
| Number of Items | 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 | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap - Image 1](https://m.media-amazon.com/images/I/519NUFqGbhL.jpg)
![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap - Image 2](https://m.media-amazon.com/images/I/71bG5wwyC7L.jpg)
![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb | RH 10-90%, air temp -4 to 122F, dew point, wet bulb, T1-T2 differential (with TP890), twist sensor cap - 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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**Shop now:** [https://www.desertcart.kr/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb](https://www.desertcart.kr/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-08-13*