pH combination electrode 5221 with sleeve diaphragm and refillable electrolyte. Glass body, range 0-12 pH, 0-60 ºC, screw cap S7. This electrode is suitable for the most difficult samples, e.g. for low ionic strength samples, creams, emulsions, very viscous samples, wines, paint and samples with colloids. The encapsulated reference ensures high stability and long lifetime. The large cylindrical pH membrane provides fast response.