Timepiece testing device

A device for testing a timepiece, comprising at least one case arranged to receive calottes and/or watch heads, each said calotte enclosing a horological movement, a control member of which projects from said calotte, each said watch head enclosing such a horological movement, each said case comprising at least one removable and stackable back, a frame comprising at least one measuring support arranged to constitute a lower support said for said calotte or said watch head, and an upper portion comprising at least one cover provided with at least one locking element arranged to cooperate in a complementary manner with a locking structure which said back comprises in a closure and locking position of said case in which closure and locking position at least one upper resilient element interposed between said frame and said cover is compressed to hold each said calotte and/or each said watch head enclosed by said case, wherein each said measuring support is supported by a sole made of a flexible resilient material enabling backlash compensation and is without direct contact neither with said frame nor with said cover and is arranged to carry at least one internal sensor arranged to listen to the running of said horological movement enclosed in said calotte or said watch head in said closure and locking position where said control member or respectively said watch head bears on said measuring support, on an edge of said control member or respectively of said watch head, and wherein each said horological movement contained in said case is phonically isolated from the other said horological movements included in said case by other resilient elements contained in said case.