This saw gauge from Wookdpeckers (SG-WP) helps you align your mitre slot.
Woodworkers spend hundreds or even thousands of dollars on a table saw then spend hundreds more on high quality saw blades and still get burn marks when doing rip cuts. Even getting accurate results with a miter gauge can be difficult when the blade alignment is off. In most cases this is the result of misalignment between the miter slot fence and blade.
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 tool that rides perfectly up and down the miter slot.
The new Woodpecker 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. Regardless whether the slot is 5/8” wide like many older saws ¾” wide like most current models or even somewhat over-sized; this unique arrangement will ensure a perfect fit and smooth traveling up and down the miter slot. No tools no adjustments just instant alignment.
Another exclusive feature is its ability to be set one distance to align the blade then in an instant be reset to a different distance for checking the fence and back to the exact original location for comparison measurements. No knobs no tools no recalibration.