The Extech LT505 light meter offers wide light intensity ranges measuring up to 40,000Fc (400,000Lux) with high resolution to 0.01Fc (0.1Lux). Measure light levels in Foot-Candle (Fc) or Lux units using a precision photo diode with cosine and color correction filter. Ideal for indoor lighting tests and for checking security and safety illumination in parking garages, night time ATM areas, stairwells, landings, and hallways.