The Thermo Scientific Orion 8172BNWP ROSS Sure Flow refillable, double-junction combination pH electrode has a glass body, a free-flowing junction for use with dirty and viscous samples, a waterproof Bayonet Neill-Concelman (BNC) connection with a 1 m (39") cable , and a 0 to 14 pH range. These electrodes are designed to allow the user to change the fill solution, depending on the sample requirements, and can be used on any pH meter with a BNC or U.S. standard connection. ROSS pH electrodes also have a patented internal reference to mimimize drift and equilibrium time. The double-junction reference system separates the sample from contact with silver ions, which means the electrode can be used with samples containing silver complexing or binding agents, such as tris (hydroxymethyl) aminomethane (TRIS or THAM), proteins, and sulfides. The electrode has a small hole, for refilling the the KCl fill solution, which prolongs the life of the electrode. Glass body electrodes are useful in highly corrosive environments where epoxy could be corroded, or around proteins and other compounds with high surface tension.This electrode can be used to test dirty and viscous samples because of the free-flow junction. The junction can be cleaned by pressing the cap down between measurements, which allows the filling solution to flow through the junction and clear contaminants.

pH range is 0 to 14 (+ or - 0.01), temperature range is 0 to 100 degrees C (+ or - 0.5), with 92 to 102% slope. Body dimensions are 120 (length) x 12 mm (diameter) and the electrode can measure samples as small as 0.2 mL. The electrode uses 3M KCl Orion 810007 fill solution. Buffer and storage solutions are sold separately.

pH electrodes are used in pH meters and testers to measure the acidity or alkalinity of a substance. They are often constructed of glass, which senses hydrogen ions, and generates a millivoltage that is picked up by the filling solution and transferred to a wire that connects to the pH meter.

Thermo Fisher Scientific manufactures analytical instruments, laboratory equipment, consumables, and software under the Thermo Scientific and Fisher Scientific brands, among others. The company was founded in 2006, and is headquartered in Waltham, MA.

What's in the Box?

• Thermo Scientific Orion 8172BNWP pH electrode
• Removable bulb guard
• (2) 60 ml bottles fill solution, 810007