The Climomaster Velocity & Temp Probe 6541-2G from Kanomax measures air velocity and air temperature when used with the Climomaster Hot Wire Anemometer. The 6541-2G is uni-directional and it will measure air velocity from 20 to 6000 fpm and air temperature from -4 to 158 °F. The probe is uni-directional, so the wind direction mark located at the tip of the probe must be faced into the air flow in order to obtain accurate air velocity data.