EXTECH Multifunction Water Quality Meter: Handheld, -2 to 19.99, 0 to 199.9 mS, 0 to 100 g/L, Auto - 4TXG6|DO700 - Grainger
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Handheld AZ86031 Water Quality Meter PH Meter Oxygen Tester PH Conductivity Salinity Temperature Meter|PH Meters| - AliExpress
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