... ion measuring allows to measure: potential value, pH value (or pX value), ion concentration. Conductive measuring can measure: conductivity, resistivity, TDS ... Measuring:1.1. Can measure potential value, pH value (or pX value), concentration of ion.1.2. Can measure several normal ... also store 6 kinds of ion measuring value including corresponding pX value and ion concentration value 100 sets of each. 4 ...