A reading device adapted to read an interface surface provided on a product item, the interface surface having disposed thereon coded data which includes, at a plurality of locations on the interface surface, a corresponding plurality of coded data portions, each coded data portion being indicative of an identity of the product item, the reading device including: a housing adapted to be held by a user in use; a radiation source for emitting radiation from the housing such that it exposes at least one coded data portion; an image sensor for sensing the at least one exposed coded data portion; a processor for determining, using at least some of the sensed coded data, product identity data indicative of the identity of the product item.