Features 1、The illuminance unit (Lx/FC) and temperature unit (℃/℉) can be switched. 2、It can be connected to Bluetooth communication and operated by mobile app. 3、Automatic range, sensitive response, can measure low light environment. 4、The screen backlight can be turned on for easy operation in the dark room. 5、The shell made of ABS material is wear‑resistant, durable and not easy to damage. Specification 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 Package List 1 x Digital Luxmeter (Battery Not Included) 1 x Plastic Storage Box 1 X USB Data Cable 1 x Instruction