For all your pH measurement needs

The accuracy of your pH measurements depends on the instrumentation you use. Our extensive assortment of quality pH electrode, sensors, and probes are designed to make your complex measurements routine, reliable, and accurate—in the lab or in the field. They are available in a variety of body materials, body styles, and sample requirements.

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Popular pH electrodes
Featured pH electrodes categories

Our specialty electrodes include pH half-cell electrodes, reference half-cell electrodes, Karl Fischer titration electrodes, and halide titration electrodes.

Our low maintenance, non-refillable pH electrodes are designed to be simple to use and maintain, with TRIS-compatible, lead-free options available.

Our flat surface ph electrodes are TRIS compatible and ideal for measuring small volumes or moist surfaces, like Agar gel plates, meats, and cheese.

Our range of micro, semi-micro glass, and semi-micro epoxy pH electrodes are designed for measuring pH in small volumes or narrow containers. 

Our pH refillable epoxy electrodes are designed for rugged field use. TRIS-compatible, impact-resistant, and lead-free options are available.

Our pH refillable glass electrodes offer chemical resistance and are designed to withstand high temperatures. TRIS-compatible options available.

Our spear-tip pH electrodes are TRIS compatible and specially designed to measure pH of soft samples, like fruit, cheese, and meat.

Our Orion Sure-Flow pH electrodes offer a unique, clog-free design for increased reliability and extended electrode lifetime.

Our Thermo Scientific™ Orion Triode pH/ATC electrodes have built-in temperature sensors, allowing simultaneous pH and temperature measurement in one electrode.

Our ORP electrodes are designed to reliably measure the oxidation reduction potential of water.

Choose from a variety of pH electrode accessories, including adapter cables, extension cables, storage sleeves, bases, and more.

Choose the right pH meter for your lab

This interactive Orion pH Meter Selector Tool will help guide you to the ideal Thermo Scientific Orion benchtop or portable meter and accessories based on your requirements. 

Find your meter


Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate and AquaSensors products.