Patent ID: 7698827

Claim:
A gauge, comprising: a. a rectangular plate i. penetrated by a centrally located slot, ii. comprising at least one straight edge, and iii. marked with angular indicia, wherein 1. each indicium comprises two aligned lines, one of which is on each of two sides of the slot, 2. the angular indicia range between square to the straight edge and at least as few as 30 degrees relative to the straight edge, and 3. the angular indicia comprise two nested ranges of angles, wherein a. a first of the two ranges of angular indicia comprises aligned indicium lines positioned i. at angles beginning square to the plate reference edge, and ii. further from the slot than the indicium lines of the second of the two ranges of angular indicia, and b. the second of the two ranges of angular indicia comprises angles relatively closer to 30 degrees to the plate reference edge than the first range, b. a metal fence having parallel faces that are square to a face of the plate when the fence is secured to the plate, and c. a threaded fastener for temporarily securing the fence to the plate in desired locations to position it at desired angles relative to the fence edges.