Look here DSI : Shade-X for the complete info.
ShadeX is a new product introduced by X-Rite at the ADA meeting in Las Vegas. This simple wireless device allows users to quickly take a shade using the most advanced digital color matching technology. This is a great device for matching composite shades, following the progress of whitening or just documenting a patient’s shade.
ShadeX retails for under $1,000 and can be ordered from Sullivan Schein