The lux (symbol: lx) is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, "lux" is used in both singular and plural.
5 Digital Display. Auto Ranging. Automatic Power Off. Fc / lx Function Selectable. HOLD Function. Range Display. Automatic Zero When Power On.
Storage Temperature:Dimension / Weight:Accessories:169(L)×63(W)×37(H)mm (6.7”×2.5”×1.5”)Battery, instruction manual, carrying case.-10 to 50°C (14 to 122°F)Accuracy: ±3% (Calibrated to standard incandescentlamp 2856°K)Temperature characteristics:Response time: 0.5 secLight detector: SI PhotodiodeOperation temperature: 0°C ~ 40°C(32°F ~ 104°F)Operation humidity: 0~80% RHStorage Humidity: 0 to 70% RHSpecificationsMeasuring level range: 0.0 to 199.9/1999/19990/199900 lx0.0 to 19.9/199.9/1999/19990 fcAutomatic or manual selection of rangeResolution: 0.1 ~ 100 lx, 0.1 ~ 10 fc±0.1% / °C(25°C)Over range: “-OL-” displayPower supply: 1.5V type AA battery x2Power life: Approx. 80 hoursWeight: Approx. 185g[Note] 1fc =10.76lxAngle deviation from cosinecharacteristics10° ± 1% 30° ± 2%60° ± 5% 80° ± 20%