... Photometer, Whiteness Meter, Turbidity Meter, Colorimeter, Gloss Meter, Tintometer, Automatic Polarimeter, Auto Melting Point Apparatus, Automatic Refractometer, Abbe Refractometer, PH/DDS/TDS Meter, etc.PHscan ... temperature key. The meter with automatic temperature compensation for accurate reading under changing conditions.Replaceable Electrode:The life of electrode is about one year ...