This compact vane anemometer measures air velocity in fpm, m/s, km/h, mph and knots across a 80-5910 fpm (0.4-30 m/s) range, with a fast sub-1-second response from its 1.3 in low-friction rotating vane. A 4-digit LCD shows Min/Max and data-hold readings, and the one-handed body runs on a single 9V battery with a 10-minute auto shutoff. This unit ships with an included NIST-traceable calibration certificate.