Ultrasonic Thickness testing uses high frequency sound that travels through a material and when the sound hits an air interface it stops and travels back. The properties of theses sound in metal make them great for measuring thickness or deterioration levels of a pipe wall, pressure vessel wall, and plate material. It can also be used to map out internal or break in a bolt that is in service. With UTT you can pinpoint the depth of an Internal defect or accurately measure material thickness with-in thousandth of an inch. See More