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The C-342 is NaCl solution (342 PPM) This HM Digital TDS Calibration Solution is also known as Water Tester Solution andTDS Meter Calibration Solution Use the HM Digital TDS Calibration Solution (342 PPM) to periodically re-calibrate your HM Digital TDS meter or HM Digital Water Quality Tester Sealed with a coated foam liner Comes in lightweight HDPE plastic bottles