... 3 points for pH using USA or NIST buffer sets; Up to 5 points for ion concentration measurement3. Auto-buffer recognition eliminates ... , pH4.00/6.86/9.18 or USA, pH4.01/7.00/10.01 Ion Calibration Points 2~5 points, 10-2 ... )mol/L Temperature Compensation 0~100oC, 32~212oF, Automatic or Manual Built-in Ion mode Na+, Ag+, K+, NH3+, CL-, F-, Ca2 ...