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The PMA90 9-Volt Digital Anemometer/Thermometer with Air Flow Measuring from Pyle uses conventional angled vane arms with low-friction ball bearings and an NTC-type thermistor for accurate, speedy readings (1/sec). It measures air velocity, air flow and temperature. It measures velocity in M/sec, Km/H, Ft/Min, MPH, and knots while it measures air flow in CMM and CFM. The PMA90 automatically powers off after 20 minutes to save power. The device operates on a 9-volt battery, which is not included.