This is a single-compartment tube that has a straight design, is made of sturdy borosilicate glass, and has a B14 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 the reference electrode.