Automatic Measurement of Steel and Aluminum: Designed with dual technology, the non-destructive coating thickness gauge enables surface coating inspection by automatically detecting ferrous and non-ferrous substrates. A useful and versatile gauge for many applications: Ideal for checking the thickness of automotive paint, such as car paint fittings, powder coating, anodized aluminum, bathroom fixtures, bicycle frames, stadium seats, outdoor canopies, furniture, swing sets, cabinets and lockers, computers, home appliances and toys. 【Automotive Performance on Used Cars】 Sometimes the body does a great job of visually hiding everything, which can't tell us that the car has been involved in a serious accident. When buying a used car, check the car's paint to make sure that each panel has approximately the same paint thickness. Easy-to-read display: The paint thickness gauge with the large screen shows the metal type, working mode, number, battery status and readings in µm or millimeters.