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Pocket pH, ORP and temperature tester. Waterproof, with an easily replaceable electrode. It has a pH measurement range -2.00 to 16.00 pH, ORP range +-1,000 MV, temperature range -5.0 to 60.0 ° C / 23.0 to 140.0 ° F. it also has automatic temperature compensation and calibration at one or two points.