---
product_id: 277197596
title: "RH390 Precision Dual Display Hygro Thermometer Psychrometer"
brand: "extech"
price: "Bs.5773"
currency: BOB
in_stock: true
url: https://www.desertcart.bo/products/277197596-rh390-precision-dual-display-hygro-thermometer-psychrometer
store_origin: BO
region: Bolivia
---

# 0-100% RH accuracy ±2% Sensor response <30s Temp range -4 to 140°F RH390 Precision Dual Display Hygro Thermometer Psychrometer

**Brand:** extech
**Price:** Bs.5773
**Availability:** ✅ In Stock

## Summary

> 🌿 Stay ahead of the curve with precision you can trust!

## Quick Answers

- **What is this?** RH390 Precision Dual Display Hygro Thermometer Psychrometer by extech
- **How much does it cost?** Bs.5773 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/277197596-rh390-precision-dual-display-hygro-thermometer-psychrometer)

## 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

- • **All-Inclusive Power:** Comes with lithium battery included, so you’re ready to measure right out of the box—no downtime, no hassle.
- • **Ergonomic & Durable:** Slim, rubberized sides ensure a secure grip during on-the-go inspections or lab work—style meets function.
- • **Rapid Response Sensor:** Capacitance sensor updates humidity readings in under 30 seconds—stay ahead of changing conditions effortlessly.
- • **Wide Measurement Range:** From freezing cold -4°F to scorching 140°F and full 0-100% humidity coverage, perfect for any professional setting.
- • **Precision at Your Fingertips:** Dual display lets you monitor humidity & temperature or dew point simultaneously for smarter environmental control.

## Overview

The Extech RH390 is a professional-grade dual display hygro-thermometer psychrometer offering precise humidity (0-100%) and temperature (-4 to 140°F) measurements with ±2% accuracy. Featuring a fast-responding capacitance sensor and ergonomic rubberized design, it’s engineered for quick, reliable environmental monitoring in any setting.

## Description

RH390 Precision Dual Display Hygro Thermometer Psychrometer

## Features

- Measures relative humidity from 0 to 100% and temperature from -4 to 140° F (-20 to 60° C)
- Accuracy ±2% from 20% to 90%; ±1.8°F (±1°C)
- Dual display of humidity and temperature or humidity and dew point or humidity and wet bulb
- Capacitance sensor responds under to humidity changes in under 30 seconds
- Slim design with rubberized ides for better grip

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Extech Instruments |
| Part number | RH390 |
| Item Weight | 200 g |
| Product Dimensions | 7.87 x 4.83 x 22.86 cm; 200 g |
| Batteries | 1 Product Specific batteries required. (included) |
| Item model number | RH390 |
| Size | L |
| Color | green |
| Style | Hygro-Thermometer Psychrometer |
| Pattern | Thermometer |
| Voltage | 9 Volts |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Plug Profile | Tabletop |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| tech_spec_battery_description_toys | Lithium |

## Product Details

- **Colour:** green
- **Brand:** Extech
- **Product dimensions:** 48W x 229H millimeters
- **Item weight:** 0.2 Kilograms
- **Battery description:** Lithium

## Images

![RH390 Precision Dual Display Hygro Thermometer Psychrometer - Image 1](https://m.media-amazon.com/images/I/81EX-VFz4RL.jpg)

## Available Options

This product comes in different **Style** options.

## Frequently Bought Together

- Extech RH390 Precision Dual Display Hygro Thermometer Psychrometer
- Protimeter BLD5365 Surveymaster Dual-Function Moisture Meter

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**Shop now:** [https://www.desertcart.bo/products/277197596-rh390-precision-dual-display-hygro-thermometer-psychrometer](https://www.desertcart.bo/products/277197596-rh390-precision-dual-display-hygro-thermometer-psychrometer)

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-22*