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One of the top-selling ORP meters great for testing negative ORP is the Milwaukee Instruments MW500 with the brand new se300 negative orp probe all off these products you can use for doing your water Demonstrations with your Mini Demo Ionizer.
This top-of-the-line model can measure the oxygen redox potential in the negative numbers of Ionized water when using conjunction with the MA9025 ORP Probe Oxidation Kit the oxidation kit is required to measure the negative ORP readings needed for your demonstrations. It is best the condition the probe for 2 to 3 days to ensure accurate readings.
Manufacturer Milwaukee Instruments