The InPro 3253 is a pre-pressurized, liquid filled, METTLER TOLEDO pH and ORP sensor with low maintenance requirements, made for high performance measurements in demanding applications. Designed with a steam-sterilizable pH glass membrane, the InPro 3253 can withstand the rigors of chemical and biopharmaceutical processes, including autoclaving, while complying with relevant hygiene and safety regulations. The InPro 3253i is the digital version of this sensor and offers ISM advanced predictive diagnostics to simplify both installation and calibration.