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12.88 mS/cm Calibration Solution, Conductivity Salinity Calibration Fluid for Salinity Tester, EC Meter, TDS Meter, 7 in 1 Tester Standard Calibration, 4 Bottles of 50mL 12.88 mS/cm Solution auspowers_batchone 3 layers to improve your12. 88 mS cm Calibration Solution, Conductivity Salinity Calibration Fluid for Salinity Tester, EC Meter, TDS Meter, 7 in 1 Tester Standard Calibration, 4 Bottles of 50mL Product Features Easy Storage! 4 bottles of 50mL of calibration solution. Use only a small part each time, the unopened solution is not contaminated. Convenient to use. Make your Salinity EC TDS Meter More Accurate! Do you have the following troubles? Just bought a salinity meter,