Proster Anemometer: m/s: 0.40-30; ft/m: 80-5900; km/h : 1.4-108; mile/h: 0.9-67.0; Knots: 0.8-58.0 CFM: 0 to 99990 0 to 9.999ft2; CMM: 0 to 99990 0 to 9.999ft2; CMS: 0 to 9999 0 - 9.999 m2 Multi-function Wind Speed Meter: Reading hold, maximum, minimum, etc for Hand-held or Fixed Measurement Portable and Professional Wind Gauge: Large LCD display backlight measuring instrument, easy to read data in dark Handheld Anemometer: Power Supply: 9V6F22 Battery (Included), low battery indicator with auto power off functions