Circular Chart Recorders by PalmerWahl, U.S.A

All internal components are corrosion resistant.• Each recorder may contain up to three (3) felt tip pens.• Pen assembly is designed to transmit the movement of thesensors into a smooth, gliding arc across the chart. Thisprevents burrowing, resulting in longer pen life and betteraccuracy.• Micro adjustment feature simplifies calibration.• Wire linkage.• Palmer PC-11 multi-speed battery operated chart drive isstandard. Electric (115 or 220V and 60 or 50 Hertz), orSpring Wound optional. Rotation periods include 24 and48 hours and 7, 8, 30, 31 and 32 days.s to your needs.