An anchor for an anchoring with, for example, a synthetic resin mortar in an anchoring hole in an anchoring substrate made, for example, of stone, concrete or masonry. In order that a displacement of the anchor in the direction of a mouth of the hole and, as a result, potential failure of the anchoring can be ascertained at an early stage, a cap as position sensor holder having an electrical counter-contact, which cap is mounted on the anchor. If the anchor becomes displaced, the counter-contact moves out of contact with the anchor, with the result that the displacement can be ascertained.