【Widely used】 Measurement visible brightness, measurement range is wide.Can be widely used in such as schools, hospitals, factories, airports, families and other occasions of brightness measurement. | 【Unit switch】llumination:200000LUX,1FC=10.76LUX;Unit:LUX、FC.Press MODE key to convert illuminance unit( LUX/FC ). | 【Measurement time】S | 【MAX/MIN】Press the RANGE key to measure the MAX ,MIN； | 【Data HOLD】Press the HOLD key to enable/disable data retention； | 【Backlight function】Press the backlight button to turn on/off the backlight; | 【Auto Power Off】The meter will automatically shut down 5 minutes after starting to save power; | 【Low-battery indicator】When the battery voltage decreases to a certain level, the battery symbol in the upper right corner of the display lights up, and the battery should be replaced