What we'e all forgetting is that the one definitive factor isn't how to diagnose a fork. Before trying to determine how fork is bent, if even If it's bent, we need to know if there is a problem in the first place. The right answer is to ride the bike and see if it tracks straight or pulls.

I offered advice on how to quickly determine if a fork is pushed back, but didn't go farther because I cross bridges one at a time if and when I come to them. If the bike rides OK, then everything else is academic. If it pulls to either side, then we have something actionable, and how it pulls is the starting place for diagnosis.

BTW- there are many ways or approaches to checking a fork for squarness, starting with how the wheel sits and how the brake seems aligned to that wheel. Those will point you in a direction, and then the fork can be checked in detail by a number of equally viable methods, using tools and stuff at hand. IMO- it's not about tools but understanding the principles of measurement.