Sauter tu us ultrasonic thickness gauges sauter tu 80 001us the sauter tu 80 001us is a digital ultrasonic thickness gauge operating on the same principle as sonar it is capable of measuring the thickness of various materials with an accuracy as high as 001mm or 0001 inches it is suitable for use on a wide range of metallic and non metallic materials sauter tu 80 001us ultrasonic thickness gauge 80mm 001mm