This is a single-compartment tube that has a straight design, is made of sturdy borosilicate glass, and has a B10 socket. The flexibility of choosing between a replaceable silica-based or glass porous frit adds versatility to its construction Its user-friendly design streamlines the refilling process, ensuring simplicity of use. Significantly, Importantly, the incorporation of a replaceable glass frit plays a key role in prolonging the life of the reference electrode, thereby improving its overall durability and performance. ​It needs to be filled with the same reference solution as in reference electrode.