Use this gray scale finder as a visual guide for comparing light-to-dark gray scale values. The scale includes values from one through 10 which can help you identify tones in an artwork or photograph so you can accurately create shadows and highlights with graphite.Details:5" x 6.5" (12.7cm x 16.6cm)Values 1 through 10Includes a range of tones from black to whiteEnsure there is good lighting conditions when using this tool