The Model H10, pH/ORP/Temperature meter and the Model H10C, Conductivity/Salinity/TDS/Temperature meter are battery powered microprocessor based precision instruments. The Model H10 features auto buffer recognition during calibration, automatic temperature compensation and it monitors the electrode’s slope and offset reporting the electrodes efficiency. The Model H10C uses a 4 wire conductivity electrode that measures from 0.001 to 200 mS. The H10C features automatic temperature compensation, auto ranging and user adjustable temperature and TDS coefficients.