Hand-held ultrasonic thickness gages are an accurate, repeatable tool for nondestructively measuring wall thickness from one side of a part in both manufacturing and service environments. They can be used on metals, plastics, composites, ceramics, glass, and rubber at thicknesses from approximately 0.1 mm (0.004") up to very thick sections of hundreds of millimeters or many inches. They work by measuring the time it takes for a pulse of high frequency sound waves to travel through the test piece. A small probe known as an ultrasonic transducer that generates and receives sound waves is placed on the surface of the part and acoustically coupled with a drop of liquid. The sound pulse travels from the contact surface to the inside wall and bounces back as an echo that is detected by the gage.
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