Summary

Tramming bar and standard indicator block.

The standard indicator block is use to get a glass sufrace flat, then the tramming bar is used to when adjusting the router.

See this video for tramming instructions.

https://www.youtube.com/watch?v=FzFPadoZH5Q

Link to the Harbor Freight Indicator

https://www.harborfreight.com/1-in-travel-machinists-dial-indicator-63521.html