The electrode is often used in the alkali solution for electrochemistry measurement. Example, in the research of Nickel alkaline rechargeable batteries and alkaline fuel cells, Reference electrode is required to withstand strong alkali. Alkaline/Mercurous Oxide Reference Electrode is a kind of electrodes for this purpose.

When the internal solution is 1M NaOH
HgO + H2O + 2e = Hg + 2OH- E0=0.098 V vs. NHE 25C
D.J.Ives and G.J.Janz, "Reference Electrodes," Academic Press, New York,1961

The electrode body is made of Teflon, and the electrode liquid junction is made of special porous material. Therefore, the electrode can withstand strong alkaline solution and good conductivity in eletrochemistry measurement.

Internal solution can be freely exchanged. E.g. 1M NaOH, or KOH solution, even 6M of NaOH or KOH are available.

Price $298