Device for testing a watch member, comprising at least: a holding device, arranged to receive and hold in place the watch member, a fixing device, arranged to fix the holding device on a testing machine, characterized in that one of the holding device and of the fixing device comprises a counter-shape at least partially matching the other of the holding device and of the fixing device, and in that the counter-shape is arranged to allow an adjustment to fix the holding device according to at least seven distinct relative orientations between the holding device and the fixing device.