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Economical portable pH meter with mV measurement mode, 1 to 3 points calibration, automatic temperature compensation, setup menu contains 7 options, accuracy 0.01 pH.

Professional portable pH meter with relative mV measurement modes, 1 to 5 points calibration, setup menu contains 10 options, accuracy 0.002 pH.

Professional portable pH/ion meter with pH, oxidation-reduction potential and ion concentration measurement modes, setup menu contains 12 options, accuracy 0.002 pH.