# View history

An icon in “History” column shows that at least one calibration was started for the measuring point. Click the icon to open the calibration history.

![](https://3107031480-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FPTZRr97g6y1opAswEdao%2Fuploads%2Fgit-blob-45aa540ce36324b507d2c0398f2c0740e94eb38a%2Fimage342.png?alt=media)

The history contains records of all the unfinished and finished calibrations of the selected MP with the offset measured. A click on the icon in “PDF” column will open a certificate from a given calibration as described in [view-certificate](https://help.boomerang3.com/boomerang-3-domain-administrator-manual/admin/calibration/view-certificate "mention").