PH Meter, DDS Meter, TDS Meter, Multipara Meter. A & E Lab. Main Products: ... Polarimeter, Auto Melting Point Apparatus, Automatic Refractometer, Abbe Refractometer, PH/DDS/TDS Meter, etc.CONscan series Waterproof Pocket Conductivity TesterCONscan series ... (L)mm×30(Dia.)mm & 85g Portable Conductivity Meter or DDS Meter.