Light meters with high performance., Measurement range: 0 to 400,000 lux or 0 to 40,000 fc (1335), 0 to 20,000 lux or 2,000fc (1337). 4 ranges/times covered (ILM 1337, stock no. 697-3834), 5 ranges/times covered (ILM 1335, stock no. 697-3822). Data hold.