Calibration
When doing measurements using a device or tool, it is important to know that this measurement has as little error as possible. There is a process, known as calibration. It consists of doing some measurements, where the outcomes are known, and comparing the mesurements of the device under test with the known values. In many cases, the device under test can then be adjusted to correct these errors. To be able to do accurate measurements, a decice needs to be calibrated regularly.