The Nasotec tweezers are great. I also use a pro ject align it tool, seeing as most of my arms are of the 9c, 9cc variety. It’s somewhat similar to the feikart, but it instead has a small disc which rests precisely on the top tonearm bearing. I find it to be pretty accurate when checked with alternate methods. Also, I use a mirrored protractor by Hudson hifi which is pretty good. I have a decent usb microscope and a nice magnifier on it’s own stand with integral flexible wand and bright led light which helps with visibility. I would highly recommend the usb microscope, as it makes nailing the overhang measurements quite easy. It’s amazing to see the stylus at great magnification. Lastly, I use a digital stylus force gauge by pro-ject.