UTT is a very versatile inspection method that can be used to measure wall thicknesses of most materials. Components can even be inspected while in-service and at very high temperatures.
MT is a very sensitive method for detecting fine surface breaking defects, such as cracks, in ferromagnetic material.
PT is a reliable inspection method for detecting surface breaking flaws in most materials. PT works great for components that are made with nonferromagnetic materials, such as stainless steel.
ET is very quick way to detect fine surface breaking flaws in conductive material.