Extech EC400: ExStik Waterproof Conductivity, TDS, Salinity, and Temperature

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

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Extech EC400: ExStik Waterproof Conductivity, TDS, Salinity, and Temperature

EXTECH ExStik II EC400 Conductivity / TDS / Salinity / Temp Meter – New, Unused

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