Incra IG32 Incra Gauge
This precision marking and measuring gauge is one of those gadgets that you absolutely can't get along without once you have used it the first time.  Featuring INCRA's Patented Sawtooth Positioning Racks, it can be instantly set to any position without measuring.  Its many uses include a precision measuring and marking gauge, a freestanding depth-of-cut gauge, a fence alignment gauge and a center finder.  Positioning range is 7".