We are offering digital lux meter lm 20. Measuring range:0lux200, 000lux0fc185, 806fc*accuracy: 3% rdg0.5%f.s.(10, 000lux)*digital updates:2 times s*photometric sensor:silicon diode *battery life:not less than 60 hours*operating temperature and humidity:0 40, 10%rh 90%rh*storage temperature and humidity:-20 50, 10%rh 90%rh*power:9vbattery *unit size:52.5*35.5*166mm *net weight: 110.4g *lux (lux) fc (footcandles) unit*selection function*after 5 minute auto power off*backlight function*maximum and minimum measurements*automatic measurement function(auto)*data rise and fall time is short