Ignoramus16551 fired this volley
in :

This looks very nice. I am very tempted. But I wonder, what does it
tell me that I cannot learn with only one dial indicator? Just more
convenience?

It's just WAY faster. The better ones can, themselves, be "trued" prior to
starting. Then you don't have to do the 180-swing thing until you're
tweaking out the last half-a-tenth.

LLoyd