Non-destructive testing (NDT) material testers are devices, machines and equipment that are used to determine residual stress, alloy type, hardness, microstructure, elasticity, heat treatment and other material conditions without permanently altering or destroying the material being examined. NDT material testers include a variety of instruments and a range of technologies. Examples include ultrasonic techniques, laser shearography and holographic interferometry, as well as many magnetic, thermoelectric, and electromagnetic methods. Some non-destructive testing (NDT) material testers can be mounted on a rack, in a cabinet, or on a printed circuit board (PCB). Other devices are designed to be held by hand or placed on a benchtop. Complete NDT material testing monitoring systems can continuously detect or measure flaws, thickness, or corrosion in production line, plant, production, or field applications.

