INCRA's Precision Centre Rule offers unparalleled accuracy
Find the exact centre of any workpiece up to 300mm wide. In addition to top and bottom micro-fine marking holes at every 1mm it also has a built-in protractor with guide slots at every 5°, 22.5°, 30°, 45° interval.
One of the fundamental errors woodworkers make when measuring out is marking a line then marking the next measurement line from the first; compound errors soon build up - these Rules leave that kind of mistakes as a thing of the past.