The TESTO 405 anemometer measures: air speed, volumetric flow and ambient temperature. It is ideal for air velocity measurements in rooms. Technical data Temperature - NTC Measurement range -20 to +50°C Accuracy ±0.5°C Resolution 0.1°C Flow – thermo-anemometer Measurement range 0 to 5 m/s (-20 to 0°C) 0 to 10 m/s (0 to +50°C) 0 to 99990 m³/h Accuracy ±(0.1 m/s + 5% vm) (0 to 2 m/s) ±(0.3 m/s + 5% vm) (Remaining measurement range) Resolution 0.01 m/s General technical data Weight 115 g (with batteries, without packaging) Dimensions 490 X 37 X 36 mm Operating temperature 0 to +50°C Battery type 3 micro AAA batteries Autonomy Approx. 20 h Display type LCD (Liquid Crystal Display) Probe tube length 300 mm Probe tube diameter 16 mm Probe tube tip diameter 12 mm Storage temperature -20 to +70 °C