The Phase II PHT-6011 Portable Ultrasonic Contact Impedance (UCI) Hardness Tester with Long 1 kgf Manual Probe uses "Ultrasonic Contact Impedance" to measure hardness, based on a 136 degree diamond at the end of a vibrating rod being depressed into the test surface at a fixed load. The difference in Ultrasonic vibration frequency is then calculated into a hardness value. The UCI test procedure is slower than the Dynamic Impact style, however the UCI method of hardness testing is portable, easy and accurate. It also has its own advantages when utilized for certain testing applications. UCI testers are not restricted to large mass items like dynamic type testers. These units can test thin metal as well as larger, harder metals. Another reason for the rise in popularity is due to the fact that the UCI method is categorized as "Non-Destructive", which translates into less scrap parts and lower mfg costs due to necessary inspections.

The Phase II PHT-6011 also uses "Dynamic Impact" to measure hardness, based on the Leeb principle of hardness developed by Dietmar Leeb in the 1970's. A spring loaded impact body is thrust to the test surface, effecting rebound. The speed of both the initial thrust and the rebound is measured in a non-contact mode. This is calculated as a Leeb hardness value and then automatically converted to Rockwell C, B, Brinell, Vickers and Shore Values. It has effectually brought easy, fast and accurate results to portable hardness testing.