The Testo 635 thermo hygrometer offers quick and easy humidity, equilibrium moisture, and pressure dew point measurements. Compatible with wireless probes, it combines advanced features with proven reliability. Wireless probes eliminate cable tangling and allow measurements up to 65 ft. Up to three wireless probes can be read and displayed simultaneously.

The instrument uses humidity and temperature readings to determine a wide range of air moisture measurements, displayed on a large backlit display with differential and mean values. Ten material characteristic curves are programmed to help determine equilibrium moisture. The Testo 635-2 includes memory for 10,000 readings and ComSoft3 Compact Software for data analysis. An optional Testo printer provides wireless infrared printing. The rubberized housing offers protection against dirt and impact (IP54).