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 2854K) 6%+5LUX (other visible light sources) Characteristics of cosine angle deviation: 302%; 606%; 8025% Resolution: LUX: