---
product_id: 13748161
title: "Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb"
brand: "extech"
price: "S/.1078"
currency: PEN
in_stock: true
reviews_count: 11
url: https://www.desertcart.pe/products/13748161-extech-rh300-digital-psychrometer-humidity-temp-dew-point-wet-bulb
store_origin: PE
region: Peru
---

# T1-T2 Differential Calculation Protective Twist Sensor Cap Simultaneous Temp & Humidity Display Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb

**Brand:** extech
**Price:** S/.1078
**Availability:** ✅ In Stock

## Summary

> 🌟 Master your microclimate with precision and style!

## Quick Answers

- **What is this?** Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb by extech
- **How much does it cost?** S/.1078 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/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

- • **Rugged & Ready:** Unique sensor cap twists closed to shield your device during transport and storage.
- • **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 ease of use.
- • **Field-Tested Durability:** Compact, lightweight design built to withstand demanding on-site conditions without compromise.
- • **Advanced Differential Metrics:** Calculate temperature differentials with optional probe for pinpoint environmental analysis.

## Overview

The Extech RH300 Digital Psychrometer is a compact, field-ready device that simultaneously measures 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 professionals demanding accurate 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.

Review: good item have used these types off and on for years - This has always been my go to when i need dew point reading
Review: Good value. - It came in handy for a project we were working on. It’s surprisingly accurate, durable, and easy to read. Definitely worth the purchase.

## 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 | #653,703 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 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 - 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/71bG5wwyC7L.jpg)
![Extech RH300 Digital Psychrometer, Humidity, Temp, Dew Point, Wet Bulb - 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 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

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

It came in handy for a project we were working on. It’s surprisingly accurate, durable, and easy to read. Definitely worth the purchase.

### ⭐⭐⭐ 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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*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-08-23*