The ultrasonic hardness tester based on a patent filed in 1961. Therefore the hardness measurement is performed through a diamond placed on a spring. Due to its design and measurement method, the ultrasonic tester allows a simple and non-destructive analysis of metallic objects. The ultrasonic tester enables measurements on various construction parts, since it is programmed to measure with different SI-units, the most common of which are the hardness scales according to Rockwell, Brinell and Vickers. Featuring a RS-232-interface the ultrasonic durometer can be connected to a computer in order to read out and print out the measured data. The ultrasonic tester allows a detailed overview of all the data, since it can record even the thresholds as well as mean values. The mean value is automatically generated as soon as more than one measurement is performed with the ultrasonic tester. Its design allows reaching even locations that would be otherwise hard to reach, and it allows reviewing and reading the values comfortably at its graphic display. Due to an option to calibrate, the ultrasonic tester can be always calibrated by the user at any time. A calibration might be necessary, if for example the last measurement was more than three months back, or when the environment is significantly different from before, if the ultrasonic sensor has already performed a major amount of measurements, or if the measurement of a defined calibration object shows a divergent. Range of use - Hardness measurements of the flanged edge and gear root stamping, mold, sheet, surface hardened tooth and gear groove - Hardness tests of central axes, thin-walled pipes and vessels - Hardness testing of tires and turbine rotor - Hardness tests of cutting blades - Hardness testing of welded parts - Hardness tests of certain opening depths, convex depressions, irregular levels - Hardness tests of most ferrous and non-ferrous metals and other alloys in industrial production.