An additional low tech item that I noted was a Squeegee. The ide behind this item is that the protruding handle would make it easier to grasp for use as a straight edge. The squeegee would allow for those with motor skill difficulties to easily grasp and use it in order to draw a straight line. It also helps children who cannot seem to keep their fingers out of the way when using a ruler as a straight edge to do just that....no more straight lines interrupted by finger bumbs!