brand new and high qualityThis meter is a portable, professional measuring instrument with large-screen LCD and backlight, multi-unit switching functions.This meter can be used for hand-held or fixed measurement.This meter has the functions of reading hold, maximum, minimum, etc.It has a low battery indicator .Specification:Wind velocity:m/s(meter per second): 0.80~30.0 (2.0% reading+50)ft/for m (feet per minute): 78~5900 (2.0% reading+5)for km/h (kilometer per hour): 1.4~108.0 (2.0% reading+50)mile/h(mile per hour): 0.9~67.20 (2.0% reading+5)Knots(nautical miles per hour): 0.8~58.0 (2.0% reading+50)ft/s(feet peer second):1.30~98.50(2.0% reading+50)Air Flow:CFM: 0 to 99990 0 to 9.999ft2CMM: 0 to 99990 0 to 9.999m2CMS: 0 to 9999 0 - 9.999 m2Flow Area SettingMAX/MIN FunctionDisplay Back lightAuto Power OffLow Battery indicationPower supply: 9V6F22 Battery(Not Included)Size: (L*for W*H)17.20*8.80*4.50cm/6.77"*3.46"*1.77"Quantity:1 SetNote:Size for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon.And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes:1pc * HYELEC MS6252A Multifunction Digital Anemometer1pc * English Manual1pc * Canvas bag