Features 1、Can measure current illuminance and temperature, measure difference value, maximum and minimum. 2、Switch between the lighting and temperature units and the measurement range is (0‑200000) lx. 3、With backlight and data retention, automatic switching of measurement gear functions. 4、With automatic power off, automatic and manual data storage functions. 5、The shell is made of high‑quality ABS material, wear‑resistant and durable, not easy to damage. Specification Item Type: Luxmeter Material: ABS Model: WT81B (Bluetooth Version) Measuring Range: 0Lx~200,000Lx Temperature Measurement Range: -9.9~49.9℃ Accuracy: ±3% rdg±f.s.(<10,000Lx), ±4% rdg±10%dgts.(>10,000Lx). Operating Temperature and Humidity: 0℃~40℃, 10%RH~90%RH. Storage Temperature and Humidity: -20℃~50℃, 10%RH~90%RH. Temperature Accuracy: ±1.0℃ LCD Screen Update: 2 Times/Sec Power Supply: 3 x 1.5V AAA Battery (Battery Not Included) Package List 1 x Luxmeter (Battery Not Included) 1 x Instruction