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  The Macbeth ColorChecker® is a unique test pattern scientifically designed to help determine the true color balance or optical density of any color rendition system. It is an industry standard that provides a non-subjective comparison with a "test pattern" of 24 scientifically prepared colored squares. Each color square represents a natural object: human skin, foliage, blue sky, etc, providing a qualitative reference to quantifiable values. Each color will reflect light in the same way in all parts of the visable spectrum, thus maintaining color consistency over different illumination options.
 

Each packet contains: One set of KODAK Color Control Patches (nine-patches that includes - Two saturations of each patch, one KODAK Gray Scale (20 steps in 0.10 density increments between 0.0 [white] and a practical printing black of 1.90 density), and one Kodak Separation Guide.

Separation Guides are used as the set up guide to calibrate several digital color print systems. In addition, helps photographers compare the color of the subject with known printing colors. Also helps Graphic Arts camera operators identify separation negatives and positives for color reproduction processes.
  The Gretag/Macbeth ColorChecker White Balance card is a full size version of the white reference square used in the standard 24-patch ColorChecker. This white is scientifically engineered to provide a precise uniform surface that is spectrally neutral (reflects equal amounts of red, blue and green) in all types of light conditions.
  XBrite Gray Scale
  Delta 1  18% Gray Cards