A reading device for reading an interface surface provided on a product item, the interface surface having disposed thereon coded data indicative of an identity of the product item. The reading device includes a harness having a finger portion, and a housing coupled to the harness finger portion for mounting on at least one finger of the user in use. The housing includes an aperture, and a sensor is provided in the housing for sensing at least some of the coded data through the aperture. A processor determines product identity data indicative of the identity of the product item using at least some of the sensed coded data.