For no particular reason, I popped for the Woodpecker dial caliper in the picture. About $100, but I find it's so easy to use that I use it more often. It showed me there was about .004 variation in the face of the fence. Not much of an error, but I needed to take it into account setting the outfeed end.
I bought a Laguna Fusion 10 inch saw, found one of the wings was warped just about one mm, so I couldn't get the table really flat. Called Laguna (about 2 hours away in Newport Beach area and they said bring it in. So I did and they replaced the entire saw with a new one they'd set up perfectly! They even used a huge machined straight edge and feeler gauges. The top had one small area off to the right, near the end that was .015 low, which is basically perfectly flat. In case anyone wonders why I LOVE Laguna tools. Here's the picture, pretty, isn't it. Definitely an indulgence though.
The more I do, the less I accomplish.