This handheld digital light level meter has a built-in silicon photo-diode light sensor with spectral response filter (with cap). It has been designed for the measurement of light and temperature. It provides rapid, accurate readings displayed on an easy-to-read backlit LCD dual display. The device features data hold, min/max and auto power off. The ergonomic design is highly portable and pocket-sized. There is a low battery indicator. Requires 3x AAA batteries.