The Triplett Model CFM1 Anemometer measures Air Velocity up to 59ft/min (3m/s), Air Flow (Volume) to 99 CFM/CMM, and Air Temperature 122°F/5°C) for use in HVAC System installation and maintenance, cleanrooms, kitchen exhaust systems, wind power monitoring, construction, sailing/boating, vehicle aerodynamics and many other applications. It has side mounted function keys for easy one hand operation. Measurements are displayed on a dual backlit easy-to-read LCD display. Min/Max/Avg recalls highest, lowest and average (2 hour max) readings and Data Hold freezes the reading on the display when taking measurements in areas where the display cannot be easily viewed. In addition, a memory location stores a commonly used area size for easy recall (1 each for CFM and CMM).The auto power off (with disable) function consereves battery life. The CFM/CMM Anemometer includes (3) AAA batteries and a pouch case. 1 year warranty.