The Digital Grey Kard - Mini is a calibrated and tested white balance card / digital color correction tool for digital photography. Digital Grey Kard Mini consists of a 1-1/4 x 2-5/8 x 1/8 inch (67 x 33 x 3 mm) color calibrated white balance tool / color reference card. Easy to follow instructions and a convenient carry lanyard with detachable clip are included.