Specifications: Range 0.000 - 1999 Lux 2000 - 19999 Lux 20000 - 50000 Lux Range setting Manual through key buttons Resolution 1 Lux 10 Lux 100 Lux Accuracy ± 6% of reading ± 1 digit Peak wave length 560 nm Sensor type Silicon Photodiode Sensor sensitivity 100 scotopic LUX Sensor stability ± 2% change per year (in the first two years) Battery/Life 1 x 9V/150 hours continuous use Environment 0 to 50¡C; RH 95%