Primary KidsRuler Features inches, half inches, quarter inches and a standard ruler. Measurement starts in small easy segments. The half inches introduce the unique color-coding system which makes the concept of measurement easy to understand. The quarter inches allow students to grow with confidence. The KidsRuler even has fraction equivalents written directly at each increment for easy understanding. The design allows students to easily transition into using the standard ruler. Each little line now has a name and the lines have meaning, making success in measurement possible. The unique end caps allow multiple units to be attached. This gives students the opportunity to measure in units greater than 12 inches.