Handy tool accurately interprets value differences or contrasts between hues, or use it to compare colors with surrounding objects. Features ten swatches: Value 1 (black), Values 2-9 (dark to light grays) and Value 10 (white). Unique notches allow you to completely surround a color so nearby colors don't interfere. Use when creating tints, shades and tones of original hues. 4x6".