Item Type: Luminometer Material: ABS Model: GM1020 Battery: 1.5V 2 x AAA Battery (Battery Not Included) Purpose: Light illuminance, weak light and strong light measurement Measuring Object Illumination and temperature, illuminance difference, maximum and minimum illuminance and temperature, integrated illuminance and integration time, average integrated illuminance Measuring ObjectIllumination and temperature, illuminance difference, maximum and minimum illuminance and temperature, integrated illuminance and integration time, average integrated illuminance OptoelectronicsSilicon diode Thermal ProbeNTC thermistor Illuminance Measurement RangeTotal measurement range: 0-200,000 Lx, divided into four ranges X1: 0-199.9Lx X10: 200-1999.9Lx X100:2000-19999.9Lx X1000: 20000-200000Lx Temperature Measurement Range0-40 Illumination Accuracy3%rdg (below 10000Lx) 4%Rdg (Above 10000Lx) Temperature Accuracy1.0 Unit of brightness and temperature4 combinations of units are available Lx/ Lx/ FC/ FC/ 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. Manual: Up to 60 sets of data can be stored. Whether to store or not is determined manually. LCD Display Frequency UpdateTwice per second Operating Temperature/Humidity0-40, 10-90%RH Storage Temperature/Humidity-20-50, 10-90%RH