Amprobe TMA-21HW Hotwire Anemometer with Temperature Hot-wire anemometer measures air flow volume and velocity, air temperature, dew point, and wet bulb, and is used by HVAC/R technicians to measure wind flow and temperature in air conditioning systems Hot-wire sensor eliminates moving parts for more consistent results Measures air velocity in feet per minute (ft/min), and meters per second (m/s), knots (KNT), kilometers per hour (km/h) and miles per hour (mph), air flow volume in cubic meters per second (CMS) and cubic feet per minute (CFM), and dual-scale thermistor temperature sensor measures temperature in F and C Telescopic probe for positioning sensor USB port exports data, and data hold for recording data, and minimum, maximum, and average temperature readings