User can select 3 ranges: 0.00 - 1999 Lux, 2000 - 19999 Lux or20000 TO 50000 Lux. The range setting through key buttons. Resolution of 1 Lux / 10 Lux / 100 Lux with accuracy of ± 6%. The peak wave is 560 nm with silicon photo diode sensor. 9 Volt battery - 150 operational hours.