Reference Electrodes

These compact, glass-bodied reference electrodes are available in two styles. The 7.5 cm long RE-5B reference electrode is used for electrochemistry experiments and is compatible with the C-3 Cell Stand, the CGME Controlled Growth Mercury Electrode Cell Stand, and the RDE-2 Rotating Disk Electrode Cell Stand. The RE-6 reference electrode (3 cm) is designed for use with the Electrochemical Flow Cell. All electrodes have a 6 mm OD glass body, and use a porous junction (frit) made from a ceramic material (RE-6) or CoralPor™ (RE-5B). (Note that, due to the high resistance of the ceramic frit, the RE-6 electrode is only recommended for aqueous electrolytes.)

Connection to the cell lead is via a gold-plated pin on the end of a flexible plastic-coated wire (RE-5B and RE-6) An O-ring is included with each electrode. Between uses, reference electrodes should be stored with junction tips in a MR-5275 vial filled with 3M NaCl.

A double junction reference electrode can be set up using an RE-5B reference electrode with the glass chamber MF-2030. This chamber also has a CoralPor™ frit, which must be maintained.

Ordering Information

Silver/Silver Chloride Standard Reference Electrodes

Part Number Description


 RE-5B Ag/AgCl (3M NaCl) Reference Electrode with Flexible Connector


 RE-5B Ag/AgCl (3M KCl) Reference Electrode with Flexible Connector


 Storage vial for Ag/AgCl reference electrodes (Aqueous only)


 Glass tube with porous CoralPor™ tip


 Double-junction reference electrode chamber


 Porous CoralPor™ Tips 1/8" long (5/pkg.) with 1/2" lengths of Teflon heat shrink (6/pkg.)


 Teflon heat shrink tubing, ~4mm OD x 30cm


 O-ring, 1/4", 12/pkg


 Silver Wire, 0.5mm dia., 12" (30cm) long - 99.9% purity

Silver/Silver Chloride Electrochemical Flow Cell Reference Electrodes

Part Number Description


 RE-6 Reference Electrode with Flexible Connector

 MW-2021    RE-4 Ag/AgCl Reference Electrode   


 Storage vial for Ag/AgCl Reference Electrodes (Aqueous only)


 PEEK Reference Electrode Retainer


 RE-4 Bushing, 10/pkg.


 O-Ring for RE-4 and RE-6, 10/pkg.


 O-Ring for Non-aqueous solvent, RE-4 and RE-6

Non-aqueous Silver/Silver Ion (Ag/Ag+) Reference Electrode Kit



This kit contains the parts required for construction of a non-aqueous silver/silver ion reference electrode. The glass electrode body has a porous CoralPor™ tip attached with heat shrink tubing. The removable Teflon top contains a silver wire and 0.060 " gold-plated connecting pin for the cell lead. The kit also contains solid silver nitrate, extra heat shrink tubing, and extra porous CoralPor™ tips. Non-aqueous solvents must be supplied by the user. An instruction sheet illustrates easy assembly.


Part Number Description


 Non-aqueous Reference Electrode Kit


 Glass tube with porous CoralPor™ tip, 6mm OD 7.5cm long


 Non-aqueous reference electrode: Glass tube with CoralPorTM tip and cap with Ag wire


 Porous CoralPor™ Tips 1/8" long (5/pkg.) with 1/2" lengths of Teflon heat shrink (6/pkg.)


 Silver Nitrate – 1 g

Other Reference Electrodes

Part Number Description
 EF-1352  Calomel Reference Electrode
 EF-1354  Chloride Free Reference Electrode
 EF-1369  Alkaline Reference Electrode
 MF-2063  Copper/Copper Sulfate Reference Electrode 

Storage Solution

 Part Number  Description
 CF-3000  3M Sodium Chloride Storage/Refill Solution
 CF-3001  3M Potassium Chloride Storage/Refill Solution
 CF-3002  Saturated Copper Sulfate Storage/Refill Solution

Frequently Asked Questions

What properties are required for a reference electrode?

What are the differences between the silver/silver chloride reference electrode and the saturated calomel reference electrode?

What are liquid junction potentials, and how do they affect measured potentials?

What factors can affect the potential of a reference electrode?

How do I store reference electrodes?

Can I use aqueous reference electrodes for non-aqueous solutions?

I need to use anhydrous electrolyte, so an aqueous reference electrode is not suitable. What are the alternatives?

"Practical Problems in Voltammetry 3: Reference Electrodes for Voltammetry", A.W. Bott, Current Separations, 14 (1995) 64.