- The portable ultrasonic hardness tester solves the classic problem of portable rebound hardness testers (Leeb) which need components with a mass of at least approx. 5 kg to guarantee reliable hardness measurements | With this universal instrument you can either use the classic rebound probe or the ultrasonic probe for smaller components or surface hardnesses making it a very versatile instrument | The scope of delivery includes instrument, rebound probe, ultrasonic probe and hardness specimen | Up to 100 readings can be stored and 20 materials can be stored to avoid recalibration each time the instrument is used