This graduate thesis has elaborated the procedure for determining the thickness of the wall on metal elements with ultrasound method. The work consists of a theoretical part that is accompanied by experimental part. The theoretical part describes the ultrasound test methodology that is used to determine the thickness of metal product walls. This method is desirable because it leaves no degrading consequences on the construction. Thesis also describes the way in which the tests, its physical foundations and principles, systems and probes used, their calibration, advantages and disadvantages are conducted. Methods of processing and interpretation of the collected data are also described. The experimental part involves determining the thickness of the element wall. Here is a more detailed description of the appliance application procedure in accordance with HRN EN 14127:2012. Prior to the test itself, the test is applied appropriately. It uses a double transmitter receiver probe and gel as a contact agent. In addition to the ultrasound, an additional digital metering test was performed to confirm the results of the wall thickness. All test results are shown and a conclusion is summing up theoretical and experimental part.