Incra micro adjustable Positioner and routing fence
https://www.leevalley.com/en-us/shop/tools/jigs-guides-and-fixtures/597…
This is a great tool for control freaks. Here's some highlights from their website.
The LS Positioner is made from anodized aluminum and is micro-adjustable for precise fence placement (within 0.002" over the full range), and a wheel micro-adjusts in 0.001" increments during set-up.