Extech RH250W Humidity Meter (Hygrometer) with Bluetooth Data Logging

Measure humidity from 0 to 100% RH with ±2% accuracy and log up to 30,000 readings via Bluetooth using the Extech Connect App. The RH250W combines a backlit LCD, dew point and wet bulb calculations, and programmable high/low alarms for precise environmental monitoring.

Overview

The Extech RH250W is a professional-grade hygrometer that measures relative humidity, temperature, dew point, and wet bulb. It features a backlit LCD for clear readings in any lighting, and Bluetooth connectivity allows wireless data transfer to your mobile device. With a user-selectable logging interval from 1 second to 24 hours, you can capture detailed environmental data over time.

What stands out

• Bluetooth data logging with capacity for 30,000 readings
• High accuracy: ±2% RH from 10 to 90% RH
• Calculates dew point (-30 to 100°C) and wet bulb (0 to 60°C)
• Programmable high/low alarms for humidity and temperature
• Backlit LCD with Min/Max/Avg and data hold functions

Technical details

• Humidity range: 0 to 100% RH; resolution 0.1% RH; accuracy ±2% RH (10-90% RH), ±4% RH elsewhere at 25°C
• Temperature range: -20 to 60°C (-4 to 140°F); resolution 0.1°C/°F; accuracy ±0.5°C (±0.9°F)
• Dew point range: -30 to 100°C (-22 to 212°F); wet bulb range: 0 to 60°C (32 to 140°F)
• Data logging interval: 1 second to 24 hours (user selectable)
• Power: 3 x 1.5V AAA batteries (included); battery life approx. 100 hours continuous use
• Auto power off: adjustable; Min/Max/Avg and data hold functions
• Units: °C/°F, %RH; included accessories: batteries, carrying case

Our verdict

With its high accuracy, extensive data logging, and Bluetooth connectivity, the Extech RH250W is an excellent choice for HVAC professionals, lab technicians, and anyone needing reliable humidity monitoring.