Eddy current testing (ECT) is an electromagnetic testing technique used to inspect non-ferromagnetic materials, and eddy current array (ECA) is an advanced form of ECT that allows efficient scanning over larger areas. 

A wide range of single-purpose point sensors such as proximity sensors, lasers and photocells have long played a key role in virtually all factory automation systems by detecting the presence of parts or assemblies, performing measurements, and identifying colors.

Laser trackers have long been the portable metrology tool of choice for companies serving the aerospace, automotive and other large-scale manufacturing sectors.