Circular Chart Recorder : Input : Defined (Pl. Specify), Range : To specify, Chart speed : 1 day or 7 day one revolution, Chart dia : 150 mm (6") or 250 mm (10", Power supply : 240 VAC 50Hz Optional : Digital display built in, Cut out size : Sunrec 150 = 189* 189 Sunrec 250 = 340*340, No. of Pens : Sunrec - 150-1Pen, Sunrec - 250 - 1 Pen 4.2 Pen.