Features:  USB connect with computer for real time data uploading functions.  Precisely measuring and it can store up to 50,000 groups of data.  This meter is a digital anemometer for measuring the wind temperature, humidity, wind speed, and air volume.  Professional measuring instrument with large LCD screen and backlight, multi-unit switching functions.  Wind speed unit is switchable: m/s, km/h, mil/h, ft/m, ft/s or knots.  Area unit is switchable: m2, ft2.  Temperature unit is switchable: Celsius(°C) or Fahrenheit(°F).  Air volume unit is switchable: CMS, CMM, CFM.  This meter has the functions of reading hold, maximum, minimum, etc.  It has a low battery indicator.    Specifications:  Material: ABS+TPE  m/s(meter per second): 0.80 ~ 30.00 ±(2.0% reading+50 characters)  ft/m(feet per minute): 78 ~ 5900 ±(2.0% reading+5 characters)  ft/s( feet per second): 1.30 ~ 98.50 ±(2.0% reading+50 characters)  km/h(kilometer per hour): 1.40 ~ 108.00 ±(2.0% reading+50 characters)  mil/h(miles per hour): 0.90 ~ 67.20 ±(2.0% reading+5 characters)  Knots(nautical miles per hour): 0.8 ~ 58.30 ±(2.0% reading+50 characters)  Air Temperature: -10 ~ 60°C ±1.5°C/-14 ~ 140°F ±2.7°F  Air Relative Humidity: (20 ~ 80)%RH ±3%RH@25°C/(<20 or >80)%RH ±5%RH@25°C  Resolution: 0.01m/s; 1ft/m; 0.01knots; 0.01km/h; 0.01ft/s, 0.1°C/0.1°F, 0.1%RH  CFM: 0 to 99990/0 to 9.999ft2  CMM: 0 to 99990/0 to 9.999ft2  CMS: 0 to 9999/0 to 9.999m2  Work Height: Maximum 2000m  Work Mode: Frequency of wind speed conversion  Display: LCD  Maximum Show Value: 9999  Sampling Time: About 0.4s/time  Flow Area Setting: Yes  MAX/MIN Function: Yes  Display Back Light: Yes  Auto Power Off: Yes  °C/°F Selection: Yes  Ambient, Dew Point & Wet Bulb Temperature Selection: Yes  Low Battery Indication: Yes  USB Interface: Yes  Power Supply: 1 * 9V 6F22 Battery (NOT Included)  Operation Environment: 0°C ~ 40°C, 0 ~ 85%RH(no moisture condensation)  Detector (fan) Operation Environment: -20°C ~ 80°C, 0 ~ 95%RH(no moisture condensation)  Storage Environment: -10°C~50°C, 0~80%RH(no moisture condensation)  Item Size: Approx. 16.5 * 8.5 * 3.8cm / 6.5 * 3.4 * 1.5in  Item Weight: Approx. 153g / 5.42oz  Package Weight: Approx. 354g / 12.47oz  Package Size: Approx. 19 * 11 * 6.5cm / 7.5 * 4.4 * 2.6in    Package List:  1 * Multifunction Digital Anemometer  1 * Portable Bag  1 * CD  1 * USB Cable  1 * User Manual(English)