TubeNet

For those of you, who own a smartphone with Android OS, there is a free tuning application called "gStrings".
It works well with tuba, has a nice configurable display ("needle-type"), and seems to be very accurate even down low (at least, thats what my Korg CA-30 says).
Look it up in the market, its free! (I´m just a user, not connected to the developer.)

Karsten

Cool, though it does bum me a bit as that was number 3 on my apps to build list. Not any more.