Alpha Chem is manufactures,exporter & suppliers of Digital Potentiometer. Digital Potentiometer 3½ digit LED display along with Glass, silver , platinum , reference electrode mains operated. Range pH 0 to 200 mV 0 to 2000 Accuracy pH ——– mV ± 1 mV ± 1 digit Resolution 0.1 mV Slope correction 80% to 120% Ambient Temperature 0º C to 50º C Display 3½ digit LED display Power 230 V ± 10% 50Hz AC Dimensions 275x175x85 mm Accessories 1) Glass, Reference , Silver and Platinum Electrodes 2) Dust cover 3) Instruction manual.