Body inspection pen and detector for paint, bodywork, and putty for used cars The pen is a magnet that works by placing it straight on the body and then pulling. There are five colors for detection and inspection. The magnet detaches at one of the colors shown in the picture. Device Features 1- It identifies the surface type directly 2- It gives instant results 3- It does not need a battery Easy to use ⭕One piece for 75 and 2 for 120