pH, mV / ORP, Ion, Conductivity, TDS, Resistivity, Salinity, °C / °F -2.00 to 20.00 pH, -2.000 to 20.000 pH ± 2000.0mV 0.001 to 20000 ppm, mg/L 0 - 5.000 µS/cm; 0 - 50.00 µS/cm; 0 - 500.0 µS/cm; 0 - 5000 µS/cm; 0 - 50.00 mS/cm; 0 - 500.0 mS/cm 0 - 5.000 ppm; 0 - 50.00 ppm; 0 - 500.0 ppm; 0 - 5000 ppm; 0 - 50.00 ppt; 0 - 500.0 ppt 0 - 200.0 MΩ*cm -10.0 ºC - 110.0 ºC / 14.0 ºF - 230.0 ºF 0.01 pH / 0.001 pH 0.1 mV 2 or 3 digits 0.001 µS/cm; 0.01 µS/cm; 0.1 µS/cm; 1 µS/cm; 0.01 mS/cm; 0.1 mS/cm 0.001 ppm; 0.01 ppm; 0.1 ppm; 1 ppm; 0.01 ppt; 0.1 ppt 0.1 MΩ*cm 0.1 ºC / 0.1 ºF