The Triplett CFM100 Anemometer measures Air Velocity up to 5900ft/min (30m/s), Air Flow (Volume) to 9900 CFM/CMM, and Air Temperature 122° F/50° C). It's ideal for use in HVAC System installation and maintenance, cleanrooms, kitchen exhaust systems, wind power monitoring, construction, sailing/boating, vehicle aerodynamics, and many other applications. The CFM100 has side mounted function keys for simple 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 function (with disable) conserves battery life. The CFM/CMM Anemometer includes (3) AAA batteries and a pouch case.