Feature: 1. Digital illuminance meter, multifunction, to meet the basic light measurement needs. 2. Measure illuminance and temperature difference, maximum/minimum illuminance temperature, etc. 3. Using NTC thermistor probe, high accuracy, measuring range is 0200.000Lx. 4. Support automatic storage of illuminance data and manual storage of illuminance data. 5. The use of computerbased analysis software enables users to easily operate the meter. Specification: Item Type: Luminometer Material: ABS Model: GM1020 Power Supply: 1.5V 3 x AAA Battery (Battery Not Included) Purpose: Illumination Measurement Measurement Object: Illuminance and temperature difference, maximum/minimum illuminance temperature, integrated illuminance and integration time, average integrated illuminance Optoelectronics: Silicon Diode Thermal Probe: NTC Thermistor Measuring Range: 0-200.000Lx Divided into 4 ranges: X1 0: 199.9Lx X10: 200 1999.9Lx X 100: 2000 19999.9Lx X 1000: 20000 200000Lx Temperature Range: 0-40 Illumination Accuracy: 3%(Below 10000Lx) 4%(Above 10000 Lx) Temperature Accuracy: 1.0 Operating Temperature/Humidity: 0-40, 10-90%RH Storage Temperature/Humidity: -20-50, 10-90%RH. Package List: 1 x Luminometer (Battery Not Included)1 x Toolbox1 x English Manual1 x Data Line