Measuring arm with multifunctional end

A three-dimensional measuring device, comprising:

• an arm made up of articulated elements including:
• a fastener base,
• a first segment connected to the base by a first hinge,
• a second segment connected to the first segment by a second hinge,
• an interface body connected to the second segment by a third hinge, and
• position sensors associated with the hinges and electrically connected to an electronic acquisition unit for supplying the electronic acquisition unit with position measurement signals measuring the positions of the segments relative to one another, the interface body carrying a measuring member and a grip member enabling an operator to point the measuring member at a zone of the object that is to be measured,
• wherein the measuring member includes a male cylindrical portion having a portion engaged in a tubular coupling part secured to the interface body, the tubular coupling part is provided with a coupling locking mechanism comprising a tab mounted on a pin provided with a first annular sealing gasket bearing against a surface of the tubular coupling part, and a second annular sealing gasket is mounted between the tubular coupling part and the male cylindrical portion to be deformed between them when the male cylindrical portion is mounted in the tubular coupling part secured to the interface body.