PH Meter, DDS Meter, TDS Meter, Multipara Meter. A & E Lab. Main Products: Atomic Absorption Spectrometer (AAS), ... , Abbe Refractometer, PH/DDS/TDS Meter, etc.PHS-W series Microprocessor pH/mV MeterPHS-W series Microprocessor pH/mV meter include the PHS- ... 25CW, 3CW, 3BW. The meters are used ...