Ag/AgCl Reference Electrodes

Ag/AgCl Reference Electrodes

Ag/AgCl electrodes have long been recognized for their superior stability in sensing bioelectric signals.

  • Low offset potential
  • Stable irrespective of the direction of current flow
  • Inexpensive and convenient
  • Easy to use when compared with standard hydrogen or saturated calomel electrodes

Item# Description U.S. List Price Quantity
64-1301 Reference cell, 2 x 2 mm Ag/AgCl pellet, 6 ft lead (REF-1L)
64-1302 Reference cell, potted, P-1 pellet and 2 mm pin (REF-2L)
64-1303 Reference cell, potted, P-1 pellet and 2 mm jack (REF-3L)
Login for U.S. Pricing

The electrochemical properties of Ag/AgCl are such that recorded biopotential waveforms are faithfully reproduced.

The main feature making Ag/AgCl electrodes superior to other metals is their low offset potential. The large offset potential generated by other metal electrodes in a biomedical situation may be unstable, non-linear or unpredictable. Long-term changes in offset potential can appear as baseline drift and short term changes can be seen as increased noise.

By comparison, Ag/AgCl electrodes introduce minimal offsets. As the AgCl is ionized, Cl ions from the electrode are exchanged for similar ions in the tissue or electrolyte. Under these conditions AgCl is stable regardless of the direction of current flow.

Ag/AgCl electrodes are available in several standard configurations and custom configurations are available upon request.

DC Offset Voltage180180180
Electrode OD Metric4.54.54.5
Jack Length Metric  2
Noise1 1 1
Pin Length Metric 2 
Wire Length Metric2  
Electrode DimensionsModelOrder No.
Ag/AgCl Pellet, 2 x 2 mm (D x L),
Embedded in Epoxy Pressed into Delrin Sleeve,v6 ft. L
Flexible Prod Wire, 0.187 x 1 in (OD x L)
REF-1L 64-1301
Potted Model P-1 Pellet and 2 mm Pin,
Standard Male Luer Body
REF-2L 64-1302
Potted Model P-1 Pellet and 2 mm Jack,
Standard Male Luer Body
REF-3L 64-1303
Electrode Instructions - 660023.pdfElectrode Care Instructions