Saturated Calomel Electrode

Product Description

The saturated calomel electrode (SCE) is a classic aqueous reference based on the Hg/Hg₂Cl₂ couple in saturated KCl. At 25 °C, SCE exhibits a well-characterised potential of approximately +0.244 V versus NHE (slightly temperature-dependent). Its long-standing popularity stems from exceptional stability and reproducibility in aqueous media, making it a solid choice for precise voltammetry and corrosion work. As a mercury-based device, usage may be restricted by institutional safety policies; Ag/AgCl is often chosen where mercury handling is discouraged. When permitted, care for SCE as you would any reference: maintain the saturated KCl fill, keep the porous junction wet, and periodically check against a known standard. Double-junction versions are available to reduce sample contamination in low-chloride environments.