The Barnant 5197015 measures dissolved oxygen (DO), and is for use with a sensION meter (sold separately). It is a Clark type polarographic probe and comes with a 15m cable and a 5-pin connector.

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