TESTO 440 Set RH Humidity Meter with Probe, 0-100 %RH, Bluetooth, USB, IP54 0563 4404

The Testo 440 RH set delivers humidity accuracy of ±(0.6 %RH + 0.7 % of mv) from 0 to 90 %RH, making it a precise tool for HVAC and environmental measurements. It combines a robust main unit with a dedicated humidity/temperature probe, covering 0 to 100 %RH and -20 to +70 °C.

Overview

This set includes the Testo 440 main device and a humidity/temperature probe with a 16 mm diameter tip. The main unit features a graphic display, internal memory for 7500 measurement values, and connectivity via USB and Bluetooth for use with the Testo Smart App. Power is supplied by 3 AA batteries, providing up to 12 hours of operation. The device is protected to IP54, suitable for demanding environments.

What stands out

• High-precision humidity measurement: ±(0.6 %RH + 0.7 % of mv) from 0 to 90 %RH
• Wide measurement range: 0 to 100 %RH and -20 to +70 °C
• Calculates dew point and wet bulb temperature
• Bluetooth connectivity for remote monitoring via Testo Smart App
• Robust design with IP54 protection and graphic display

Technical details

• Humidity measurement range: 0 to 100 %RH
• Humidity accuracy: ±(0.6 %RH + 0.7 % of mv) (0 to 90 %RH), ±(1.0 %RH + 0.7 % of mv) (90 to 100 %RH) at 25 °C
• Humidity resolution: 0.1 %RH
• Temperature measurement range (probe): -20 to +70 °C
• Temperature accuracy (probe): ±0.5 °C at 25 °C
• Temperature resolution (probe): 0.1 °C
• Operating temperature (main device): -20 to +50 °C
• Storage temperature (main device): -30 to +50 °C
• Battery type: 3 x AA Mignon 1.5 V
• Battery life: 12 hours
• Display: Graphic display
• Internal memory: 7500 measurement values
• Connectivity: USB, Bluetooth
• Protection class: IP54
• Probe type: Humidity and temperature probe (Ø 16 mm)
• Calculated parameters: Dew point, wet bulb temperature

Our verdict

The Testo 440 RH set is a professional-grade instrument for accurate humidity and temperature measurement, with smart connectivity and robust build quality.