Sper Scientific 840003 Anemometer/Thermometer

Perfect for use in HVAC, environmental studies, hazardous spill clean ups, electrostatic precipitators, and all types of air flow measurements. Based on the principle that a freely turning turbine will rotate at a speed directly proportional to the wind speed. One piece construction with built-in probe. Select readout in any of 5 scales: meters/second (0.4 ~ 30), feet per minute (80 ~ 5900), miles per hour (0.9 ~ 68), knots (0.8 ~ 58), or kilometers per hour (1.4 ~ 108). Simultaneously displays temperature in °C or °F. Advanced features include RS232 output, continuous moving average, min/max/avg, auto power off, and hold functions. Comes ready to use in a hard carrying case with one 9V battery.