a support device for movably supporting the reference device and the measuring device, the support device including coupling elements with a first coupling element rotatable about a first axis of rotation parallel to said geometrical axis, and a second coupling element coupled to said first coupling element and rotatable with respect to said first coupling element about {HEAD ~ a second axis} of {TAIL ~ rotation} parallel to said geometrical axis 
a support device for movably supporting the reference device and the measuring device , the support device including coupling elements with a first coupling element rotatable about a first axis of rotation parallel to said geometrical axis , and a second coupling element coupled to said first coupling element and rotatable with respect to said first coupling element about { HEAD ~ a second axis } of { TAIL ~ rotation } parallel to said geometrical axis
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