The inclination measuring instrument BlueCLINO is optionally equipped with an integrated calibration set-up for a quick calibration procedure which enables the calibration without complex means. On the backside of the instrument precisely manufactured and placed holes are available for installing the dowel pins as calibration aids. These pins are part of the delivery and can be inserted into the holes. With the quick calibration method the values at + and - 45° as well as the exact zero value can be adjusted. By this procedure the instrument can be set to a sufficiently high precision for most of the applications.