Features: The digital luxmeter is a professional instrument for measuring illumination and brightness. Functions: Backlight and data holding,automatic power off,Automatic and manual storage data. Widely used in used in light intensity measurement engineering,quality control, offices, transportation routes, families,etc. Measure current illumination and temperature. Measure difference value, max value and min value. Switch between illumination and temperature unit. The measurement range is(0-200000)lux, auto switch of measurement gear. Backlight and data holding,automatic power off,Automatic and manual storage data. Specification: Model: WT81 Total measuring range: 0-200,000 Lux Temperature measuring range:-9.9~49.9° Illuminance accuracy: ±3%rdg(below 10000 Lux); ±4%rdg(above 10000 Lux) Temperature accuracy:±1.0° Operating temperature/humidity:0-40°, 10-90%RH Storage temperature/humidity:-10-50C, 10-90%RH LCD screen update:2 times/s Power: 3 x 1.5V AAA batteries (not included) Size: 195*55*30mm/7.7*2.2*1.2in Weight: Approx.200g/7.1oz Package list: 1 * WT81 digital luxmeter ( batteries not included) 1 * Manual