Help make math fun again with this fun Color Changing 12" Wood Ruler!
12" ruler features an English scale and changes color with the heat of your hand.
Ideal low cost marketing promotional handout for kid centered events.
Made in the USA!

Watch as the rulers go from one color to another in just seconds!
Blue goes to Light Blue
Green goes to Yellow
Red goes to Orange
Violet goes to Pink

Colors chosen at random.