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Multiparameter pH/ORP/EC/TDS/Salinity/DO/Pressure/ Temperature Waterproof Meter - HI98194
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Multiparameter pH/ISE/EC/DO/Turbidity Waterproof Meter with GPS option - HI9829
Multiparameter pH/ISE/EC/DO/Turbidity Waterproof Meter with GPS option - HI9829
Hanna HI-98194 Multiparameter Water Quality Meter - YouTube