The usage of an ultrasonic thickness gauge for non-destructive testing to check thickness, is regular in all areas of industrial measurements. The ability to gauge thickness measurement without requiring access to both sides of the test piece, offers this technology a multitude of possible applications. Paint thickness gauges, ultrasonic coating thickness gauges, digital thickness gauges and many more options are available to test metal and other materials. Along with coating thickness, it is widely being used for thicknesses of metals and also serves as major testing equipment in the corrosion industry and refineries.