A manual tool for inserting a clip (10) with elastic coupling in a seat, having a body (23) from which protrudes a pusher (32) for the clip and a sensor (34) for detecting the thrust force of the pusher. An electronic controller (24) receives a force signal from the sensor (34) and emits a signal (25, 26) reporting correct or incorrect insertion depending on the pattern of the force signal detected during the insertion of a clip. A movable gauging element is advanced during the insertion thrust of the clip to detect the correct expansion of the clip at the end of insertion.