Traction and tension dynamometers are used to measure force in tension, traction and weighing applications with cables, guy wires and chain. Traction and tension dynamometers are used to measure traction or tension in many different applications, including testing cables on suspension bridges or adjusting tension on electrical cables or telephone wires. Dynamometers are available as simple dials that use a printed scale and needle to show force measurement. They are also available as digital devices with a central processing unit (CPU) for reporting data with great accuracy.