... potential, fast response speed and easy to use3) The meter adopts intelligent chip design, which has automatic calibration, automatic ... water hardness units can be chosen freely: mmol/L, mg/L (CaCO3), mg/L (CaO), mmol/L (Boiler), mg/L (Ca) and other three units, fH ( ... Calibration Solution:B1, B2 and B3/btl (250mL)Electrode Holder 602Data Storage 128 groupsPower DC9V power adaptorDimension and weight ...