Product highlights 40 to 5000 FPM (0.2 to 25 m/s) Compatible with Dwyer AP1 thermo-anemometer and RP1 thermo-hygrometer wired probes (sold separately) Included 100 mm vane probe is able to measure air velocity, volumetric air flow, temperature, and humidity High contrast and backlit LCD for visibility in any condition Able to store up to 99 readings for later evaluation Each Unit Includes Handheld with 100 mm vane thermo-anemometer probe hand strap 9 V alkaline battery carrying case