The glass bob sensor can be used in place of a traditional steel spike bob, when the user wants to eliminate the risk of a metal part being introduced into the production process. It will not damage equipment or harm the product if the bob becomes crushed during processing, being that glass is essentially sand. The glass bob sensor is compatible with other products, software, and accessories in the SmartBob product line. It can be used in a mixed network of SmartBobs which are measuring other materials.