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Hanna Instruments Grochek LCD pHep 4 Waterproof PH Temperature Meter | HI98127: Science Lab Ph Meters: Amazon.com: Industrial & Scientific
Multiparameter pH/ISE/EC/DO/Turbidity Waterproof Meter with GPS option - HI9829
Hanna Instruments HI 9813-6N Waterproof pH/EC/TDS Temperature Meter Clean and Calibration Check for Growers, 0 to 50 Degree C, 9V Battery: Amazon.com: Industrial & Scientific