Hi, tunedwolf
I use them a lot, work in the power industry and connect up generators to distribution transformers when we have cable faults.
I use the Kyoritsu 8031 which has led voltage indicators and a little 3Ø motor inside which drives a disc with a mark on it.
We also use the Densokki phase sequence meters as well which only have a disc in them.
I have a schema somewhere and if i can find it will post it on this forum.
Personally i don't trust the neon ones which only show correct or not correct.
The damage done when phasesequence is wrong or changed by not testing prior to disconnecting can be a lot more expensive and possibly buy you 10 of those meters at $100 each.