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Redox Electrode

The Redox microelectrode, here shown with a tip diameter of 500 µm.
The Redox microelectrode can be mounted with a steel needle to make the glass sensor stronger on the longitudinal axis.
The Redox microelectrode must be connected to a reference electrode, here shown with a tip diameter of 100 µm.
The Redox microelectrode signal must be amplified by a high-impedance amplifer e.g. the Unisense pH/mV-Meter.
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Measure redox potential in microenvironments

With the tip size down to 10 µm, less than 5 seconds in response time, and 1 mV in resolution, the Unisense Redox microsensor offers a high quality research tool for reliable and fast measurements.

The microsensor construction makes it possible to use the Redox microsensor in a broad variety of research fields where non-destructive, fast and accurate measurements are required. The redox microelectrode is designed for research applications within:

  • Environmental sciences
  • Biomedical sciences
  • Biotechnology
  • Microbiology

Microelectrode technology:

The Redox electrode tip will develop an electrical potential relative to the reference electrode when both electrodes are immersed in the same solution and connected to a high-impedance millivolt-meter e.g. the Unisense pH/mV-Meter. This potential reflects the tendency of the solution to release or take up electrons; also called the Oxidation-Reduction Potential (ORP). The Unisense Redox microelectrode can be used for measurements in salinities from 0 to full ocean strength.

The reference electrode can be either external (separate electrode) or internal; however, we only recommend internal references in applications where it is not possible to place two electrodes in the sample.

Ordering Information

Standard Glass Sensor Outside tip diameter
RD-10 8-12 µm
RD-25 20-30 µm
RD-50 40-60 µm
RD-100 90-110 µm
RD-200 175-225 µm
RD-200C 175-225 µm (combination electrode with internal reference electrode)
RD-500 400-600 µm
RD-500C 400-600 µm (combination electrode with internal reference electrode)
RD-MR 400-600 µm
RD-N 1,1 x 40 mm - needle sensor
RD-NP 1,6 x 40 mm - needle sensor for piercing


Find a complete list of redox microsensor specifications below and possible microeletrode customizations and adaptations under Related Products found to the right.

View Redox Microelectrode Specifications

Technical information

View electrode specifications

Related products

Sensor Customization

Kristensen,E. et al (2011), Contrasting effects of the polychaetes Marenzelleria viridis and Nereis diversicolor on benthic metabolism and solute transport in sandy coastal sediment, Mar Ecol Prog Ser, 125 - 139, vol. 425

Schmidt,O. et al (2011), Novel [NiFe]-and [FeFe]-Hydrogenase Gene Transcripts Indicative of Active Facultative Aerobes and Obligate Anaerobes in Earthworm Gut Contents, Applied and Environmental microbiology, AEM - 05432, vol.

Vilalta,E. et al (2005), Structural heterogeneity in cyanobacterial mats is associated with geosmin production in rivers, Phycologia, 678 - 684, vol. 44 Read abstract

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