... Colorimeter, Gloss Meter, Tintometer, Automatic Polarimeter, Auto Melting Point Apparatus, Automatic Refractometer, Abbe Refractometer, PH/DDS/TDS ... DDS-11AW Technical Dates:1.Single Point Push-Button Calibration:DDS-W series with single point calibration function, you need only ... set conductivity value of the calibration solution at 25oC ...