This Amprobe light meter measures the visible light from fluorescent, metal halide, high-pressure sodium or incandescent sources. It is a portable, easy-to-use digital light meter designed for simple one-hand operation reading in Lumen (lux) or foot candle (fc) units. This light meter measures a wide range of light up to 20,000 fc or 200,000 lux with an accurate, high resolution of 0.01 fc-lux. This unit is Auto-ranging plus manual ranging with ability to Zero out the reading before taking a measurement. Use this light meter to measure the illumination level in the interior and to switch off or reduce or increase the output level of lighting fixtures. Reduce the energy burdenof the building by significantly increasing the efficiency of its lighting system.