Electronic Test Equipment is used to create stimulus signals and capture responses from electronic devices under test (DUTs). In this way, the proper operation of the DUT can be proven or faults in the device can be traced and repaired. Practical electronics engineering and assembly requires the use of many different kinds of electronic test equipment ranging from the very simple and inexpensive such as a test light consisting of just a light bulb and a test lead to extremely complex and sophisticated such as automatic test equipment. Biomedical devices are materials that interact with biological systems to replace, improve or repair specified physiological conditions. Although often used for medical applications, biomedical products also describes many other elements, including fermentation-produced enzymes and pharmaceutical products, diagnostics and novel biomaterials.