4 Display modes: Press SHIFT button: TDS - ppm & °C, EC - µs/cm & °C, TDS - ppm & °F, EC - µs/cm & °F. TDS: 0 - 9999ppm;. Resolution: TDS: 1ppm; EC: 1µs/cm. For checking TDS/salt (NaCl) levels freshwater aquariums, ponds and water purification systems.
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