Used to be that the TNC was only available from Tony directly. That's how I bought mine 2 years ago. I had heard that Tony's health was not good and that he has stopped producing them. However, Don's Hobby Shop has been advertising them recently in the magazines. $99.

http://www.donshobbyshop.com/

You will have to call, as Don's website does not show much in the way of product.

I also have a Magnum tach, which is similar to the H9 with the angled display. It works very well, as long as you are pretty close to the prop. The TNC is a bit more stable, and it can read from further away. By pressing a button on the side, you can have it display an extra digit, down to 10 rpm resolution.

A great investment and well worth it.

For either tach, when the sunlight is getting low, or even at night time, I simply aim a large battery operated flashlight on the front of the prop (in front of the engine) and stand behind the prop with my tach. Works extremely well.