Woodpeckers Table Saw Gauge and Alignment Tool, Auto-Adjusts to Miter Slot, Includes Dial Indicator & Fitted Storage Case - SG-WP;

For a perfect cut, the saw blade and rip fence must be dead parallel to the left hand miter gauge slot. The most reliable and accurate way to do this is with a dial indicator and a tool that rides perfectly down the center of the miter slot. The new Woodpeckers Saw Gauge is engineered to expertly satisfy this need. It's the first alignment tool that automatically adjusts to the width of the miter slot through the use of three precision ground steel pins. Whether the slot is 5/8-inch wide like many older saws or 3/4-inch wide like most current models, this patent pending design ensures a perfect fit and smooth travel up and down the center of the miter slot. No tools, not adjustment, just a perfect fit.