Recommendations for setting VTA

All of the other cartridge alignments are possible for me to set with some level of confidence, but then there is VTA. Yes, I am confident when making parallel, the tonearm with the platter, but then there is the sighting of the stylus position in respect to the groove. Is there a microscope made especially for this task? FWIW, I own a Schiit SOL, and yes, it has adjustable VTA on the fly, but trust me, it is the coarsest adjustment that you can imagine, and in my case, broken to start with! TT came that way when I bought it second hand.