This compact 6-in-1 environmental meter measures air velocity, air temperature, ambient temperature, relative humidity, light and contact temperature. The LM-8000 features Data Hold, Minimum/Max functions and has been designed for one handed operation. Measures air velocity/temperature, ambient temperature, relative humidity, contact temperature and light. Easy to operate, designed for one hand operation. Air velocity is measured in m/s, ft/min, km/h, mph or knots. Light levels are measured in foot-candles or lux. Temperature is measured in Celsius or Fahrenheit. Data Hold and Max/Min functions. Zero adjustment button (light meter). Low battery indicator and auto shut off. 6. 1"H x 2. 4"W x 1. 3"D. Air velocity range of 0. 2 to 30. 0 m/s; 1. 4 to 108. 0 kph; 0. 9 to 67. 0 mph; 80 to 5910 fpm; 0. 8 to 58. 3 knots. Air velocity resolution of 0. 1 m/s; 0. 1 kph; 0. 1 mph; 1 fpm; 0. 1 knot. Temperature range of -148 to 2372 degrees Fahrenheit (-100 to 1300 degrees Celsius). Temperature resolution of 0. 1 degrees Fahrenheit (0. 1 degrees Celsius). Humidity range of 0 to 95% RH. Humidity resolution of 0. 1%RH. Light range of 0 to 20,000 Lux (0 to 2000 ft-cd). Light resolution of 1/10 lux (0. 1/1 ft-cd). Powered by a single 9V battery (included). Weighs 8. 8 oz. (160gram). Fast responding, pocket size design allows for one-handed operation.