【Digital Lux Meter】The digital illuminance meter is used to measure the intensity of objects invading light. The intensity of illumination has a great effect on human health, especially eye health. 【High Resolution and Measurement Range】Measurement range: 0.1~200,000 Lux, 0 .01~20,000Fc; resolution: 0.1Lux/0.01Fc; measurement accuracy: + -4%; measurement speed: 2 times/second. 【2 Types of Units for Selection】Units can be switched freely: Lux or FC, 2 measurement modes: maximum / minimum measurement. Digital Lock (HOLD) function. 【2 ranges, Auto Off】 Auto and manual ranges, the default auto range when enabled. Press and hold the HOLD key to select the manual range: 200--2000--20000--200000 - AUTO. Automatic shutdown for 15 minutes without operation, low battery reminder function, low battery symbol display. 【Wide Application】It has a wide range of applications including but not including limit, for use in schools, factories, warehouses, offices or homes, from design to exquisite photography projects and so on.