PH Meter, DDS Meter, TDS Meter, Multipara Meter. A & E Lab. Main Products: Atomic Absorption Spectrometer ... Melting Point Apparatus, Automatic Refractometer, Abbe Refractometer, PH/DDS/TDS Meter, etc.TDSscan series Waterproof Pocket TDS TesterTotal Dissolved Solids ... TDSscan series with platinum sensor, giving you quick, reliable conductivity measurement. Double junction sensor, you can replace it ...