... long life Digital illuminance meterInstruction 1,The Digital illuminance meter is a precision instrument used to measure illuminance in the filed ... its construcion 4,The light sensitive compeonent used in the meter is a very stable ,long life sillcon didoe ,Features 1, ... measuring values 4,Unit and sign display for easy reading 5,Automatic zeroing 6,Meter corrected for Luminous Efficiency function 7 ...