Apparatus for pH measurements

Electrolyte container for saturated potassium chloride solutions used as an electrolytic bridge between sensitive portions of a flow-through pH electrode and a pH reference electrode. The container inhibits so-called "KCl creep" from the solution and consists of an essentially closed polymeric container having means which define separate orifices through which sensitive portions of the electrodes can be inserted for electrical contact with the solution, the orifice defining means also serving to retain the housings of the electrodes in a sealing relationship to the solution. Preferably, the orifice defining means and electrode retention means consist of resilient silicone electrode retaining rings or sealing glands which form a portion of at least one wall of the container which is preferably made from a transparent cast acrylic resin.