Cygnus Instruments Ultrasonic Thickness Gauge
The Cygnus Instruments ultrasonic thickness gauge can be used to measure metal thickness even through coatings. The probe does not need to touch the surface under test, as measurements can be taken through 5 mm (0.2 inch) of water. Readings are not influenced by the probe orientation.
See the Cygnus Instruments website or the instructions that came with the system for more information.