Team Digital has been selling the X-Rite ColorChecker Passport for some time now. This is a must have tool for critical colour work. Its perfect for studio use, when you just have to get that colour 100% correct. Its also good for wedding and portrait photography with the checkers warm to cold swatches. Allowing you to select what degree of warmth you need in a image. It also reduces your image processing time and improve quality control in your Raw workflow.
This compact and robust colour checker is a must for any studio or camera bag.
This a X-Rite video showing the Colorchecker Passport in action.