Tiffen DANES-PICTA GC5 
5-Patch Grey Wedge for Digital Cameras

Gray card from Danes Picta.
90% white, 50% light gray, 18% gray, 4% dark gray and 1% black.
Thickness: 2 mm
Size: 6x20.3 cm

Using the GC5 chart, you accurately set colour balance and detailed gradation of your shots. The chart is suitable tool for reflection copy reproduction, but also for taking photographs of any three dimensional objects for art, advertising or documentation purposes. Use your chart by difficult lighting conditions and other situations when precise colour rendition is necessary. 

Place GC5 Chart aside your scene not to interfere with your object. Be sure, that the chart is illuminated by the same light as the object, without shadows on chart itself. By carefully placing the chart it can be masked out of the finished print, or simply make two exposures one with and one without the chart. To save your camera memory, you can cut out the chart from the first shot right in your camera. Then you can past the chart into "right" image in your computer.