... Refractometer, Abbe Refractometer, PH/DDS/TDS Meter, etc.TDSscan series Waterproof Pocket TDS TesterTotal Dissolved Solids (TDS) comprise inorganic salts and small ... function. Themeter is permitted to use TDS standard solution, you need only set known TDS value in the meter and immerse ... electrode into TDS solution, press CAL key, the ...