摘要：

The fastening unit (10) has a plane contact surface (24) for contacting the fastening unit at a reference surface, and another plane contact surface designed parallel to the former contact surface. The latter contact surface contacts an attaching part, in particular for contacting a measuring device at the fastening unit. Spring elastic contact surfaces (28, 30) are provided for contacting at a surface, which has a curvature opposite to a contact plane in an unloaded condition, where the contact plane is defined by the contact surface (24) of the fastening unit.

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