The Brand is "Planet Waves" (I think a brand of D'Addario) and the product names is "Multi-Function Tuner".It is a tuner that has a "sweep" or "strobe" function. It can be feed through (1/4" I/O jacks) or it has a clip-on piezoelectric unit to tune off the headstock, soundhole, or bridge (for upright bass) or it has a built-in microphone if you want to just leave it on a stand. Both tuning functions work well, but I prefer the "strobe" setting. Additionally it is fully chromatic, and with the clip-on piezoelectric pick-up you might even be able to use it on a tuba.
Why is it a deal? Guitar Center is clearing them out. The "list" price is $70. They are on eBay for $30. Guitar Center has them for $10 ($9.95). It's small, useful, and cheap. If you have a Guitar Center local, it might be worth it to stop by.