This is a childs drawing toy.  I used it to make sure it works.  The knobs control up, right, left, and down.  To erase shake it eigther up & down or sideways.

All rulers, meter sticks, hangars or clips, racks, train-tracks, etc. used to display or give size or color reference, etc. do not go with he item unless specified.  I got this from a thriftshop.  I do combine shipping.