1It has the functions of automatic storage of illuminance data (maximum 2000 records) and manual storage (maximum 60 records). 2Automatic range, sensitive response, can measure low light environment, easy to use. 3It has a wide range of applications, and it can switch between illuminance unit (Lx/FC) and temperature unit (/). 4The screen backlight can be turned on, which is convenient for darkroom operation and convenient reading. 5Made of highquality ABS material, wearresistant and durable, not easy to damage, and can be used for a long time. 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 Accuracy: 3%rdg+5dgts 10: 20.0x10 ~ 199.9x10Lx Minimum Resolution: 1Lx Accuracy: 3%rdg+10dgts 100: 20.0x100 ~ 199.9x100Lx Minimum Resolution: 10Lx Accuracy: 4%rdg+10dgts 1000: 20.0x1000 ~199.9x1000Lx Minimum Resolution: 100Lx Accuracy: 4%rdg+10dgts Temperature Range: -20 ~ 50 (-4~122) Illumination Accuracy: 3%rdg+5dgts 3%rdg+10dgts 4%rdg+10dgts 4%rdg+10dgts 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 pens (automatic storage) maximum storage of 60 pens (manual storage) Power Supply: 3 x 1.5V AAA Battery (Battery Not Included) How to Use: 1: Open the illuminance meter receiving cover 2: Install the battery 3X1.5V 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 1 x Digital Luxmeter (Battery Not Included) 1 x Plastic Storage Box 1 x Instruction