Testo Vane Anemometer with integrated humidity measurement and NTC air thermometer, incl protective cap, batteries and calibration protocol. Testo is designed for the measurement of air flow velocity, temperature and humidity. Testo's own patented humidity sensor guarantees reliable measurement results. Thanks to the integrated measurement with the 40 mm vane, it is ideally suited for fast spot checks at air vents. A timed mean value calculation is possible. The measuring instrument is very handy, small and easy to operate. Features: Flow velocity measuring instrument with temperature measurement Integrated measurement with 40 mm vane Timed mean value calculation Hold function and max./min. values Windchill calculation for outside areas (perceived temperature) Display illumination Protective cap for safe storage Including wrist strap and belt holder Air humidity measurement with long-term stable Testo humidity sensor Incl. dewpoint calculation and wet bulb Incl. calibration protocol Operating temperature - -10 to +50 °C Battery type - 2 batteries Type AAA Battery life - 60 h Dimensions - 133 x 46 x 25 mm Probe type - NTC Meas. range - -10 to +50 °C Accuracy - ±0.5 °C Resolution - 0.1 °C Probe type - humid. sensor, cap. Meas. Range - 0 to 100 %RH Accuracy - ±2.5 %RH (5 to 95 %RH) Resolution - ±0.1 %RH Probe type - Vane Meas. Range - 0.4 to 20 m/s Accuracy - ±(0.2 m/s + 2% of mv) Resolution - 0.1 m/s (Priced Per Each).