Item Type: Luxmeter Material: ABS Measurement Function: Illuminance and Temperature, Illuminance Difference, Illuminance Maximum and Illuminance Minimum Illuminance Probe: Silicon Photodiode Temperature Probe: NTC Thermistor Illuminance Range: Total Range: 0~200,000Lx Divided into 4 Levels: 1: 0~199.9Lx Minimum Resolution: 0.1Lx 10: 20.0x10~199.9x10Lx Minimum Resolution: 1Lx 100: 20.0x100~199.9x100Lx Minimum Resolution: 10Lx 1000: 20.0x1000~199.9x1000Lx Minimum Resolution: 100Lx Illumination Accuracy: 1: 3%rdg+5dgts 10: 3%rdg+10dgts 100: 4%rdg+10dgts 1000: 4%rdg+10dgts Temperature Range: -20 ~ 50 (-4~122) Temperature Accuracy: 1.0 Repeatability: 2% Refreshing Rate: 2 Times/Sec Illumination and Temperature Unit: Lx (lx)/ (degrees Celsius) Lx (lx)/ (degrees Fahrenheit) FC (foot candles)/ (degrees Celsius) FC (foot candles)/ (Fahrenheit) Illumination Data Storage: maximum storage of 2000 (automatic storage) maximum storage of 60 (manual storage) Power Supply: 3 x 1.5V AAA Dry Battery (Battery Not Included) How to Use: 1: Open the illuminance meter receiving cover 2: Install the battery 3 x 1.5V AAA (this product does not include) 3: Press the power button and move the receiver as close as possible to the measured light source (the gear is automatically adjusted according to the strength of the light source) 4: According to the buttons on the panel DIF (difference), REC (record), etc., select according to measurement requirements