Mennon Test Color Chart with 24 Colors, Small (8" x 6") Test and Calibration tool to help recognize and evaluate color deviations in photos Helps to adjust pictures fast and efficiently Industry Standard 24-color test targets 6 Natural objects of special interest, 6 RGB, 6 CMYK & 6 Greyscale patches Waterproof patches are great for professional use outdoors, Small size great for travelling.