The invention relates to a device for unilateral analysis—notably optical—of products comprising a product turning device comprising two series (18, 20) of levers (19, 21) in opposition borne by at least one conveyor continuously driven in a longitudinal direction with respect to a fixed structure, and a device (34, 37) controlling the tilting of the levers (19, 21) arranged to cause the products to be turned over in a turning zone (35) between two successive unilateral analysis work stations in the longitudinal direction. In the turning zone, several levers (19, 21) of one same series are caused to tilt by the control device (34, 37), each product being able to be turned over under the effect of the tilting of several levers (19, 21) of each series.
