LCD screen that shows light measurement value. It supports screen locking function, and maximum/minimum measurement value. Automatic ranging and measurement range can be manually switched. Automatic power-off function in 15 minutes without operation make it power-saving. The instrument will automatically detect battery, and show low battery symbol to remind user replacing battery in time. Two units of measurement: Lux and Fc. Press the MODE key after startup to switch the measurement unit. Wide range of applications: Agriculture, Library, Bedroom, Classroom, Shopping Mall, Gym, Office, Stadium, Hotel, etc.