Filter: Glass 420,470,530,620,660nm Light source: Tungsten bulb,6v 0.5A Power source: AC 220V 20VA Photoelectric ... measurement in routine analysis . The optical system consist of the Lamp , Hear - absorption filter, Lens and Diaphragm .The light trasferring in ... :log T O-2Photoelectric accuracy2TLight Source 6V 0.5 A tungsten lampIndicatorAE-11M 250U A Micro -ammeter, AE-11D three digit ...