LUX is the amount of illumination that a lamp with a light intensity of one candle receives on a surface with an area of one square meter and a vertical distance of one meter. One foot candle (FC) is the amount of illumination received on a surface of one square foot that is one foot away from a lamp with one candle intensity. 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: Material: ABS Range: 999.9, 99999, 19999 x10 LUX 99.9, 999.9, 19999 FC Accuracy: 3%+5LUX (calibration in accordance with ordinary LED lamp at 2854K) 6%+5LUX (other visible light sources) Cosine Angle Deviation Characteristic: 302%; 606%; 8025% Resolution: LUX: <1000(0.1LUX); 1000(1LUX) FC: <100(0.1FC); <1000(0.1FC); 1000(1FC) Sensors: Digital light 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) Item Size: 190 * 57 * 32mm / 7.48 * 2.24 * 1.26in Item Weight: 160g / 5.64oz Package Weight: 271g / 9.56oz Package Size: 22 * 11 * 4.5cm / 8.66 * 4.33 * 1.77in Package List: 1 * Illuminator 1 * Storage Bag 1 * User Manual (English)