Sper Scientific handheld environmental quality meter. For environmental testing anywhere-combines a light meter, humidity meter, thermometer and anemometer into a single compact unit - measures: temperature (celsius and fahrenheit); relative humidity; air speed (m/s, km/h, mile/h, knots, ft/min); and light (lux, foot-candle) - features dual display with low battery and over range indications, touch-tone buttons, maximum-minimum, auto power off and hold functions - ready to use with soft carrying case, wrist strap, instructions and a 9V battery. 5.5 ounce weight. 0 to 50 degree C ambient range; +/-1.2 degree C accuracy; 0.1 resolution. 32 to122 degree F ambient range; +/-2.5 degree F accuracy; 0.1 resolution. -100 to 1300 degree C Type K range; +/-(1 percent + 1 degree C) accuracy; 0.1 resolution. -148 to 2372 degree F Type K range; +/-(1 percent + 2 degree F) accuracy; 0.1 resolution. 10 to 95 percent RH range; +/-6 percent, 30 to 60RH otherwise +/-8 percent accuracy; 0.1 resolution. Airspeed: 0.4 to 25.0 m/s range; +/-(3 percent + 2d) accuracy; 0.1 resolution; 1.4 to 90.0 km/h range; 0.1 resolution; 0.9 to 55.9 mile/h range; 0.1 resolution; 0.8 to 48.6 knots range; 0.1 resolution; 80 to 4930 ft/min range; +/-(3 percent + 20ft/min) accuracy; 1 resolution. 0 to 20000 lux range; +/-(5 percent + 4d) accuracy; 1 resolution. 0 to 2000 foot candle range; +/-(5 percent + 4d) accuracy; 0.1 resolution. Measures 2-1/2-inches length by 1-inches width by 6-inches height.