Item Type: Luminometer_x000D_ Material: ABS_x000D_ Model: GM1020_x000D_ Battery: 1.5V 2 x AAA Battery (Battery Not Included)_x000D_ Purpose: Light illuminance, weak light and strong light measurement_x000D_ Measuring Object Illumination and temperature, illuminance difference, maximum and minimum illuminance and temperature, integrated illuminance and integration time, average integrated illuminance_x000D_ Measuring ObjectIllumination and temperature, illuminance difference, maximum and minimum illuminance and temperature, integrated illuminance and integration time, average integrated illuminance_x000D_ OptoelectronicsSilicon diode_x000D_ Thermal ProbeNTC thermistor_x000D_ Illuminance Measurement RangeTotal measurement range: 0-200,000 Lx, divided into four ranges_x000D_ X1: 0-199.9Lx_x000D_ X10: 200-1999.9Lx_x000D_ X100:2000-19999.9Lx_x000D_ X1000: 20000-200000Lx_x000D_ Temperature Measurement Range0-40_x000D_ Illumination Accuracy3%rdg (below 10000Lx)_x000D_ 4%Rdg (Above 10000Lx)_x000D_ Temperature Accuracy1.0_x000D_ Unit of brightness and temperature4 combinations of units are available_x000D_ Lx/_x000D_ Lx/_x000D_ FC/_x000D_ FC/_x000D_ Illumination Data StorageAutomatic: Up to 1900 sets of data can be stored. LuxLAB is used to set the storage period and whether to start or stop storage._x000D_ Manual: Up to 60 sets of data can be stored. Whether to store or not is determined manually._x000D_ LCD Display Frequency UpdateTwice per second_x000D_ Operating Temperature/Humidity0-40, 10-90%RH_x000D_ Storage Temperature/Humidity-20-50, 10-90%RH