The UCI method

The UCI principle determines hardness by measuring the frequency of an oscillating rod. The rod consists of a metal shaft with vibrating element and a pyramid-shaped diamond mounted on one end.
UCI man
To perform a measurement, the diamond is forced into the material by spring pressure. And the device measures the frequency and compares it to the frequency in air. The frequency is lower for hard materials and becomes higher as the indentation increases in size. The instrument converts the frequency shift to hardness value.


The main advantages of the UCI method is possibility to testing hardness of:

  • small parts;
  • thin-walled products;
  • products with difficult access to the testing area;
  • surface hardened layer.


Today, our company offers the following modifications of hardness testers with UCI probe:


UCI Hardness Tester NOVOTEST T-U2


UCI Hardness Tester NOVOTEST T-U3


As well as a combined version for solutions full range of the hardness testing tasks:


Combined Hardness Tester NOVOTEST T-UD2


Combined hardness tester NOVOTESTT-UD3