Park Tool Wag-4 Professional Wheel Alignment Gauge

This might be an easier tool to use if I built more wheels but it took a good bit of work for me to properly dish -- but tool is good quality and I got there in the end, so ... good purchase.

I can use it with a tire still on the rim.

I love the tool over all, it helps me keep our family of 5 rolling. I took 2 stars because after truing and dishing over 20 wheels the first month, I found it to be fairly clunky with the adjustment knob. Its really hard to hold the tool and wheel and make the needed adjustment. A few times I had to set it down and come back in 10 minutes or so. I was trying to get 3 sets checked in an afternoon and it slowed things way down.

Easy to use, fast check of rim to hub alignment. Makes wheel building easier!

Its a great tool if you are one of those who is obsessed with being precise. I good wheel truing stand will easily get you close enough though. As for quality; Park Tools never disappoint.