The PosiTector 200 non-destructively measures a wide variety of applications using proven ultrasound technology. Measures coating thickness over wood, concrete, plastics, composites, select metals, fiberglass and more. Please note it's not meant to be used on the metal substrate that composes many vehicles, its primary automotive application is for fiberglass and plastic surfaces. Advanced models measure up to 3 individual layer thicknesses in a multi-layer system and features a graphic readout for detailed analysis of the coating system.