Features: Lightweight And Compact: with compact size and light weight design, adopt 360° 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, 0.1Lux/0.1FC high display resolution, Lux or FC unit switchable. Light and Sound Alarm: the upper and lower limit alarm values can be set, and the audible 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: ±3%+5LUX (calibrated according to ordinary incandescent lamp at 2854°K) ±6%+5LUX (other visible light sources) Characteristics of cosine angle deviation: 30°±2%; 60°±6%; 80°±25% Resolution: LUX: <1000(0.1LUX); ≥1000(1LUX) FC: <100(0.1FC); <1000(0.1FC); ≥1000(1FC) Sensors: digital illumination probe and filter Operating Environment: -10~50, maximum relative humidity of 80%, indoor altitude < 2000m Storage Environment: -10~50, maximum 70% relative humidity. Sampling Speed: about 8 times per second Incident Angle: 120 degrees Repeat Test: ±2% 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)