This 407026 heavy-duty light meter has 4 lighting type settings for enhanced accuracy (tungsten/daylight, fluorescent, sodium, mercury). Additional features include data hold, min/max/average, auto power off and a % reading of the differential from a reference point. - Built-in RS-232 interface with optional data acquisition software and data logger. Complete with 9V battery, light sensor with 45 Inch (1.1M) cable, protective cover and holster with stand.