Reference Electrodes Line up > Hg type

Hg type

Reference electrode used for the reference potential measurement of the electrodes in electrochemical research.

  • RE-2BP
  • RE-2CP
  • RE-61AP

Calomel Standard reference electrode (saturated KCl)

SCE (Saturated Calomel Electrode) has been used as reference electrode instead of SHE (Standard Hydrogen Electrode) for the reference potential measurement of electrodes in electrochemical research.

RE-2BP Reference electrode
Reference potential
Hg2Cl2 + 2e = 2Hg + 2Cl-
E0=241 mV vs RHEK (25°C)
∗ The reference potential is the measured value using RHEK reversible hydrogen electrode kit (Cat. No. 013373).


  • Holder material: Polymethylpentene, for the high chemical resistance is used.
  • Liquid junction: Ceramic tip

Reference electrode free from chloride ion (saturated K2SO4)

The RE-2CP Reference electrode is recommended, if you dislike a contamination with chloride ion from chloride type reference electrode.

RE-2CP Reference electrode
Reference potential
Hg2SO4 + 2e = 2Hg + SO42-
E0=657 mV vs RHEK (25°C)
∗ The reference potential is the measured value using RHEK reversible hydrogen electrode kit (Cat. No. 013373).


  • Holder material: Polymethylpentene, for the high chemical resistance is used.
  • Liquid junction: Ceramic tip

Reference electrode for alkaline solution

The RE-61AP reference electrode is made of Hg/HgO instead of calomel paste, and 1 M sodium hydroxide is used as an electrolyte solution. It is used under high pH environment as reference electrode.

RE-61AP Reference electrode
Reference potential
HgO + H2O + 2e = Hg + 2OH-
E0=118 mV vs RHEK (25°C)
∗ The reference potential is the measured value using RHEK reversible hydrogen electrode kit (Cat. No. 013373).

RE-61AP is the new model of RE-6AP.
The resistance to alkaline solution has been improved.

This product is delivered with deionized water filled in, to be filled with 1 M NaOH aqueous solutions by the user.
Please pay attention to handling.
∗1 M NaOH solution used in this electrode is not provided, also we do not supply.

  • Holder material: Polymethylpentene, for the high chemical resistance is used.
  • Main body: Screw type to be removable
  • Liquid junction: Ceramic tip

Catalog No. Description Electrolyte Purpose
013458 RE-2BP Calomel reference electrode saturated KCl Standard reference electrode
013459 RE-2CP Reference electrode saturated K2SO4 Reference electrode free from chloride ion
013456 RE-61AP Reference electrode - Reference electrode for alkaline solution
  • Liquid junction: Ceramic tip
  • Isolation: Polymethyl pentene

∗Keep the reference electrode in a cold dark place.

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