Almost all the automotive manufacturers in the world have selected some form of reed sensor for monitoring the brake fluid level. The reed switch by itself is hermetically sealed, which guards against the effects of dirty harsh environments. Because of these harsh environments and extreme temperature swings, some suppliers provide the reed sensor in a vapor sealed plastic package for further insurance of proper operation in ‘under the hood’ conditions. Reed sensors have the ability to operate for billions of fault free operations. To ensure fault free operation, Standex Electronics tests each sensor dynamically for thousands of operations on every reed sensor that is sent to the customer. This dynamic contact resistance test has the ability to detect potential early failures which are eliminated from shipment.