An inspection machine inspecting the conformity of products comprises a first roller equipped with first housings positioning the products, a second roller parallel and opposite to the first roller equipped with second housings positioning the products, transfer means transferring the products into an overturned position from the first housings to the second housings, a first device checking the conformity of the products positioned in the first housings, a second device checking the conformity of the products positioned in the second housings, at least one of said first and second checking devices comprising an image acquisition system from a transit zone of the products and at least one first and one second lighting system respectively of the transit zone arranged and configured for the acquisition from the transit zone of a first and a second image respectively in each of which the products are positioned substantially at the same spatial coordinates.