I own the H9 Tach, and while I am a Horizon Hobby proponent, 10X, 8611, three Saito's and more, lots more ! I just received my TNC 48 hours ago.

Reason for the purchase, unstable readings . While it does the job in the end (after it has been turned, held 2" from the prop and finally provided with some DC light sources-----though not all at the same time) -----------I simply said ENOUGH !

I can't give you an evaluation of the TNC under flying conditions until next year. To date all I've been able to prove is that it gives readings (against AC light sources) under light conditions so low that I have to use a flash light to read the screen --------