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Apera Series EC60 Cond/TDS/Salinity Waterproof Conductivity Pocket Tester

Hanna Instruments HI98129, pH, Conductivity, TDS Tester

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Hanna Instruments HI9813-6 Portable pH/EC/TDS/Temperature Meter ONLY

Hanna Instruments HI9813 Portable pH/EC/TDS Meter

Hanna Instruments HI9813-5 Portable pH/EC/TDS/Temperature Meter