... , 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 ... , the meter will indicate electrode slope,you can judge by the indicator to replace electrode or not.Automatic Temperature Compensation:PHS-3BW with ...