Other names for the string pot are yo-yo pot, draw wire transducer, position transducer, or cable extension transducer. The string pot devices are available in analog or digital and have a status as an attractive approach for many applications in different industries and are used to control and measure linear position and velocity using a flexible cable and spring-loaded spool instrument. With relatively non-critical alignment requirements, compact size, and ease of installation string pot devices are the linear measurement system of choice in applications as diverse as bone densitometers in the medical industry, crash testing in the automobile industry, pump jacks in crude oil extraction and irrigation and flood control in water management.