OK -- I have a TRUE "Dyno" (Turbo Dyno 45), but... I also own an Indi Dyno v2...
The Indi is GREAT for reseating brushes, etc. -- all sorts of motor breakin tasks. It does measure RPM, but since it is under "no load" conditions, they are pretty meaningless.
Take it for what it is -- if that is what you want, fine...
"If you cannot win, make the one ahead of you break the record."
Biff Racing Team #420 (Ah... The "good old days"...)
The local indoor Offroad Track: The RC Race Barn
TLR22-3.0, TLR22T-2.0, TLR22SCT-1.0