I bought and use a longacre digital gauge with rim clamp. I didn't have a good level and wanted the rim clamp to do various cars with rims that might cover the hub. About $242 vs $140 for a fast trax.

The digital gauge is an Acculevel that's magnetically held in the tool so you can easily keep it in your toolbox as a level to do pinion angle, carpentery, etc.. So I treated as a alignment tool + common digital level that sells for around $50.