The Testo humidity/temperature probe head (product no. 0636 9730) enables precise and convenient measurement of indoor air temperature and relative humidity. It’s designed for use with the Testo universal handle (Bluetooth® or cable version – available separately), allowing for modular flexibility across multiple measurement tasks. With an accuracy of ±2% RH and ±0.5 °C, this probe covers a full measurement range of 0 to 100% RH and -20 to +70 °C, making it suitable for both short-term checks and long-term environmental monitoring. The probe head features Testo’s long-term stable humidity sensor, which is traceable to international standards (e.g., ILAC, PTB, NIST) and ensures consistently reliable data. When recalibration is needed, only the probe head needs to be sent in, minimising downtime and maintaining workflow efficiency.