RS Pro Anemometer Hot Wire Sensor. RS Pro anemometer hot wire sensor is a high performance telescopic probe, for use in very low air velocity measurement. Features and Benefits. Offers a hot wire and standard thermistor. Delivers rapid and precise measurements. Support recording maximum/minimum readings. Telescopic. Note. RS Pro anemometer hot wire sensor designed for use with RS Pro AM4204 hand held Hot-wire Anemometer.