User Calibration of UCI Hardness Tester T-U2.

Each of the saved main calibration may be further corrected.
Additional calibration is recommended in the following cases:
1- If the measurements of the device on the samples are constant, but differ from the nominal value of the standard block;
2- After extended storage (more than 3 months.);
3- After intensive operation;
4- With a significant change in the operating conditions (temperature,
humidity, etc.).