This is a magnetic paint thickness gauge. It’s magnetic tip is extremely convenient in reaching curved surfaces, and in hard to reach places. Its mechanical thickness gauge is water resistant, no batteries needed and can be used in the rain and on a dirty car. | MAGNETIC TIP: It’s magnetic tip is extremely convenient in reaching curved surfaces, and in hard to reach places. Its mechanical thickness gauge is water resistant, no batteries needed and can be used in the rain and on a dirty car. | Quickly and accurately check if the vehicle has been painted in the past.It’s shaped as a small pen, and is made of high quality materials, making it the perfect choice to carry around and always be prepared. | Colored gauge shows you exactly what you're dealing with as to thickness of metals and the paint on it, and it will easily reveal any damages. | The tester instrument is highly accurate with a micron-level color scale due to its compatibility with digital thickness gauge.