Industrial & Scientific" /> Dual-scale meter measures visible light from fluorescent, metal halide, high-pressure sodium, and incandescent sources up to 200,000 lumens per square meter (lux) or 20,000 footcandles (fc) Silicon diode sensor and filter are designed for indoor use at altitudes below 2,000 meters Manual ranging, data hold freezes readings on the display, and angled light cosine correction corrects for angled light Complies with Japanese Industrial Standard (JIS) C1609:1993 and CNS 5119 general A-class specifications, and European Community Directives: 89/336/EEC (Electromagnetic Compatibility) and 73/23/EEC (Low Voltage) as amended by 93/68/EEC (CE Marking) Powered by a 9V battery (included), and includes a 1.5-meter wire for positioning light sensor, and a protective sensor cap Measure in lux or foot-candles, front panel switchable, Measuring range to 20,0000 lux or foot candles Silicon photodiode sensor and filter Data hold to freeze reading on the digital display, Large, 3-1/2 digit display Auto power off to save battery life Includes protective sensor cap