Item Type: Luxmeter_x000D_ Material: ABS_x000D_ Measurement Function: Illuminance and Temperature, Illuminance Difference, Illuminance Maximum and Illuminance Minimum_x000D_ Illuminance Probe: Silicon Photodiode_x000D_ Temperature Probe: NTC Thermistor_x000D_ Illuminance Range: Total Range: 0~200,000Lx_x000D_ Divided into 4 Levels:_x000D_ 1: 0~199.9Lx Minimum Resolution: 0.1Lx _x000D_ 10: 20.0x10~199.9x10Lx Minimum Resolution: 1Lx _x000D_ 100: 20.0x100~199.9x100Lx Minimum Resolution: 10Lx _x000D_ 1000: 20.0x1000~199.9x1000Lx Minimum Resolution: 100Lx _x000D_ Illumination Accuracy: _x000D_ 1: 3%rdg+5dgts _x000D_ 10: 3%rdg+10dgts _x000D_ 100: 4%rdg+10dgts _x000D_ 1000: 4%rdg+10dgts_x000D_ Temperature Range: -20 ~ 50 (-4~122)_x000D_ Temperature Accuracy: 1.0_x000D_ Repeatability: 2%_x000D_ Refreshing Rate: 2 Times/Sec_x000D_ Illumination and Temperature Unit: Lx (lx)/ (degrees Celsius) Lx (lx)/ (degrees Fahrenheit) FC (foot candles)/ (degrees Celsius) FC (foot candles)/ (Fahrenheit)_x000D_ Illumination Data Storage: maximum storage of 2000 (automatic storage) maximum storage of 60 (manual storage)_x000D_ Power Supply: 3 x 1.5V AAA Dry Battery (Battery Not Included)_x000D_ _x000D_ How to Use:_x000D_ 1: Open the illuminance meter receiving cover_x000D_ 2: Install the battery 3 x 1.5V AAA (this product does not include)_x000D_ 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)_x000D_ 4: According to the buttons on the panel DIF (difference), REC (record), etc., select according to measurement requirements