Thickness Gauges provide the ability to ultrasonically test most materials for non destructive measurement. They send an ultrasonic pulse signal via a transducer at a known sound velocity through the material, and measure the time taken for the signal, or echo to bounce back. The transducer and test surface are coupled using a water-based Couplant Gel and this removes the air gap. Almost any material can be tested provided it has a known sound velocity. We offer various options and a full range of accessories and replacement parts.