Features: Lightweight And Compact: with compact size and light weight design, adopt 360 degrees rotatable photosensitive head design, and connected with a retractable spring, you can hold and operate it very conveniently. Wide Measurement Range: with wide measuring range up to 200000LUX, 0.1Lux0.1FC high display resolution, Lux or FC unit switchable. Light and Sound Alarm: the upper and lower limit alarm values can be set, and the ble and visual alarm prompt will be given once the range is exceeded. Data Hold Function: for conveniently checking the tested data and writing down the results. Clearly Display Screen: LCD display with backlight, easy for operation and reading the value. Wide Applications: can be used for measuring light intensity in home, office, school, laboratory, warehouse, factory, hospital, hotel, restaurant, airport, etc. More Features: Maximum, minimum, average, real-time value measurement, The automatic shutdown time can be set from 1 to 30 minutes, and the factory default is 10 minutes., and low battery indication function. Specifications: Range: 999.9, 99999, 19999 x10 LUX 99.9, 999.9, 19999 FC Accuracy: +-3percent +5LUX (calibrated according to ordinary incandescent lamp at 2854 degrees K) +-6percent +5LUX (other visible light sources) Characteristics of cosine angle deviation: 30 degrees +-2percent ; 60 degrees +-6percent ; 80 degrees +-25percent Resolution: LUX: less than 1000(0.1LUX); more than 1000(1LUX) FC: less than 100(0.1FC); less than 1000(0.1FC); more than 1000(1FC) Sensors: digital illumination probe and filter Operating Environment: -10~50 celsius , maximum relative humidity of 80percent , indoor altitude less than 2000m Storage Environment: -10~50 celsius , maximum 70percent relative humidity. Sampling Speed: about 8 times per second Incident Angle: 120 degrees Repeat Test: +-2percent Spectral Range: 400~700nm Power Supply: 2 * 1.5V AAA (LR03) battery(not included) Material: ABS Item Size: 190 * 57 * 32 mm 7.48 * 2.24 * 1.26 inch Item Weight: 139g 4.9oz Package Size: 22 * 11.3 * 4 cm 8.66 * 4.45 * 1.57 inch Package Weight: 252g 8.89oz Package List: 1 * Illuminator 1 * Storage Bag 1 * User Manual (English)