The Endura pH / Redox (ORP) Sensor TBX587 is the latest addition to our comprehensive industrial pH sensor product line. This new pH sensor uses the familiar solid state Next Step Reference design offered in our TB5 and TBX5 product lines.The sensor targets smaller 1 in. process connections found in sample lines in refineries, chemical plants, and other industrial applications. This product, combined with the successful TB(X)557 retractable sensor, TB(X)564 high pressure sensor, and the TB18 Safe-T-Clean valve allows ABB to address nearly any insertion sensor installation.