The reed sensor has accurate, consistent closure and opening points, representing a crucial factor in reliable operation over long periods of time. Standex Electronics performs a dynamic contact resistance test on each sensor which dynamically operates the sensor while monitoring its contact resistance for thousands of operations on every reed sensor. This dynamic contact resistance test has the ability to detect potential early failures which are eliminated from shipment. Mechanical sensors do have wearing parts that not only can become corroded, but can also wear out, resulting in faulty operation.