Amprobe TMA5 Mini Vane Anemometer Mini-vane anemometer measures air velocity, temperature, humidity, dew point, wet bulb, wind-chill, and ambient temperature, and is used by HVAC/R technicians to measure wind flow and temperature in air conditioning systems Dual-scale temperature readings in F and C Wind speed averages every two seconds and is measured in knots (KNT), Beaufort (BFT), feet per minute (ft/min), miles per hour (mph), meters per second (m/s), and kilometers per hour (km/h) Data hold saves readings for recording, and max wind speed display Auto power-off feature turns the meter off after approximately five minutes (can be disabled)