PH Meter, DDS Meter, TDS Meter, Multipara Meter. A & E Lab. Main Products: Atomic Absorption Spectrometer (AAS), Fluorescence Spectrophotometer, Bio-Spectrophotometer ... series with two points calibration function, it will prompt pH calibration solution when you calibrate the meter. You ... need only immerse the pH electrode intostandard solution and press ENTER key, then ...