The DeFelsko 200D3-G Positector 200 D3 Advanced Ultrasonic Coating Thickness Gages for Metal Substrates, 2 - 300 mils is DeFelsko PosiTector 200D3-G non-destructively measures a wide variety of applications using proven ultrasound technology. The DeFelsko 200D3-G Positector 200 D3 Advanced Ultrasonic Coating Thickness Gages for Metal Substrates, 2 - 300 mils is PosiTector 200D3-G measures thick, soft coatings like polyurea, asphaltic neoprene, very thick polymers. Advanced models of The DeFelsko 200D3-G Positector 200 D3 Advanced Ultrasonic Coating Thickness Gages for Metal Substrates, 2 - 300 mils is PosiTector 200 measure up to 3 layers with graphics.