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Dwyer 473B-1 - Vane Thermo-Anemometer Test Instrument Measures air velocity or air volume, temperature and humidity simultaneously 100mm vane probe is included Compatible with AP1 thermo-anemometer probe Compatible with RP1 thermo-hygrometer probeThe Dwyer 473B-1 100 mm Vane Thermo-Anemometer Test Instrument is a versatile unit that quickly and easily measures air velocity or volumetric air flow, as well as air temperature and humidity in imperial or metric units. A stainless steel 100 mm vane probe is included, which has a comfortable hand grip. The extruded aluminum housing fully protects electronics, yet is lightweight and comfortable to hold.The 473-B is also compatible with two other probes - the AP1 thermo-anemometer probe, and RP1 thermo-hygrometer probe. Both are sold separately.