RC 19 TECHNICAL SPECIFICATIONS:- Range 5 Ranges 0 to 1000m Mhos/cm Auto Ranging Display 3.5 Digit LED Accuracy ± 1% FS ± 1 Temp. Compensation Manual 0 to 50 deg.C Cell Constant Adjustable. Sensor Conductivity Cell. Power 230V ± 10P Hz RC20Range 5 Ranges, 0 to 1000 Mhos / cm. Auto Ranging Display 3.5 Digit LED. Accuracy ± 1 % FS ± 1 digit. Temp. Compensation Auto / Manual 0 to 50 deg.C. Cell Constant Adjustable. Sensor Conductivity Cell. Power 230V ± 10P Hz. AC