You know when you set the fence on the tablesaw to cut a particular cut and it comes time to make that cut maybe a 3/4" shorter on the next cut? When you move the fence to the left, the placement of the first cut on the tape isn't always an easy measurement to back up from. I have a 6" ruler, less than 1/16" thick and about 1/2" wide. I put that over the tape on the tablesaw with the 6" end going first. I line the existing measurement with a solid inch mark and move my fence to the left the amount I need for the next cut. I hope I explained this well. It works great for me without any guessing. Hope it helps someone else. Lorraine