The work is compressed in several parts. In the first part of the work we will be shortly introduced with NDT methods, sound physics and ultra sound, longitudinal and transversal wawes, and the laws of propagation, reflection and refraction of ultrasonic wawes on the border of two matters. After that we have a description of the working principal of ultrasonic methods in the case of pulse-echo echo, introduction of appropriate equipment for ultrasound control with schematic images of ultrasonic devices and detailing the probes, various techniques of ultrasound tests and the most important types of display signals and the most common use of ultrasound control. After the theoretical part is done, there will be an experimental part carried out, of which will be provided a method of ultrasonic inspection on steel rod-shaped products. Tests are performed on plain bearing driving gear and the turbine rotor.