A professional LED light meter specifically calibrated relative spectral sensitivity wavelength of 550mm to the JIS standard C 1609-1993 measuring corrected LED day white light spectrum. With a user selectable light source it can also measure normal light sources. Wide measuring range up to 400, 000 Lux, large LCD display and user-selectable measuring units. For environmental monitoring, health & safety checks, and industrial applications.Measures both lux and footcandles (FC) , user selectable.Supplied with protective lens cap, soft carry pouch and battery.Range 40/400/4, 000/40, 000/400, 000 Lux, 40/400/4, 000/40, 000 FC.Resolution 0.1/1/10/100 Lux, 0.01/0.1/1/10 FC.Accuracy ±3% of reading ±10 digits.Power 4 x 1.5V AAA alkaline batteries (LR-3-4) .Dimensions 162 x 63 x 28mm.Weight 250g.Features:Range selection of 5 lux ranges and 4 FC ranges.Manual or auto ranging.Over range indication.Silicon photo diode sensor and LED spectral response filter.Fully cosine corrected.User selectable light source.Zero adjustment.Sensor connected to the instrument by a fixed 1.5 metre (approx.) coiled cable.Measuring rate of 1.5 times per second.50mm LCD display with backlight, 40 segment bargraph and function indicatorsData hold freezes measured values.Min, max or average memory.Auto power off after 5 minutes of no activity (can be user disabled) .Impact-resistant ABS case.