The Dwyer 8901 Vane Thermo-Anemometer is ideal for balancing air conditioning and heating ducts or checking the operation of fans and blowers. The 8901 measures air volume in cubic feet per minute and cubic centimeters per second, as well as air velocity in ft/min, m/s, knots, km/hr and mph with ±2% accuracy. The multifunction LCD can simultaneously display air velocity and temperature or air flow and temperature in selectable units. A built-in temperature sensor provides measurements with an accuracy of ±2 with the capability to display the results in °F/°C. The Dwyer 8901 can either store measurements or transfer the data to a PC via RS-232 communication. Additional features include data hold, as well as the ability to record minimum, maximum and average readings. These units also feature a detachable probe for easy replacement, if necessary.