You are here: Products bread Sensors and Electrodes bread pH Microelectrode

pH Electrode

Miniaturized pH electrode

The Unisense pH electrode offers you a fast and reliable research tool. With tip sizes down to 10 µm, you can complete high resolution and non-destructive microprofiles in a wide range of microenvironments.

The pH microelectrode is designed for research applications within:

  • Environmental sciences
  • Biomedical sciences
  • Biotechnology
  • Food science e.g. cheese production
  • Microbiology

Microelectrode technology:

This microelectrode is a miniaturized conventional pH electrode based on selective diffusion of protons through pH glass, and the determination of potentials between the internal electrolyte and a reference electrode. 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
pH-10 8-12 µm
pH-25 20-30 µm
pH-50 40-60 µm
pH-100 90-110 µm
pH-200 180-220 µm
pH-500 400-600 µm
pH-500C 400-600 µm (combination electrode with internal reference electrode)
pH-MR 400-600 µm
pH-N 1,1 x 40 mm - needle sensor
pH-NP 1,6 x 40 mm - needle sensor for piercing

Find full pH microelectrode specifications, including warranty and expected life time, below and possible microelectrode customizations and adaptations under Related Products found to the right.

View pH Microelectrode Specifications

Technical information

View electrode specifications

pH Calibration Kit Video

pH Calibration Kit Video

Watch our complete guide to calibrating a Unisense pH electrode using our pH Calibration Kit

Watch Video Guide

Related products

Sensor Customization

Marzocchi, Ugo et al (2018), Transient bottom water oxygenation creates a niche for cable bacteria in long-term anoxic sediments of the Eastern Gotland Basin, Environmental Microbiology, 3031 - 3041, vol. 20 Read abstract

Portillo, Maria C. et al (2011), Moonmilk Deposits Originate from Specific Bacterial Communities in Altamira Cave (Spain), Microbial Ecology, 182 - 189, vol. 61 Read abstract

Liniger, Matthias et al (2003), Cleavage of trypanosome surface glycoproteins by alkaline trypsin-like enzyme(s) in the midgut of Glossina morsitans, International Journal for Parasitology, 1319 - 1328, vol. 33 Read abstract

Kamp, Anja et al (2006), Anaerobic sulfide oxidation with nitrate by a freshwater Beggiatoa enrichment culture, Applied and Environmental Microbiology, 4755 - 4760, vol. 72 Read abstract

Choquel, Constance et al (2020), Total nitrate uptake by an invasive benthic foraminifer in marine sediments, Biogeosciences Discussions, 1 - 33, vol.

See all publications