The Boss TU-3 is the newest model of the Boss tuner foot pedal. For the most part, it is very similar to Boss TU-2, it's predecessor, but it does have a few new features that help it stand out just a little bit. For those who don't know about this line of tuner pedals, they have become pretty much the first choice for a tuner pedal for both professional and amateur guitarists. I'm a big advocate for them, as the TU-2 is something that I've been using for a while now. Just about every studio that I've worked at has the TU-2, as it is simply a well designed model, which extends completely into the TU-3. Like the TU-2, the TU-3 is a chromatic tuner, consisting of a 1/4" input, a 1/4" output and another 1/4" bypass output. It can be powered by either a nine volt battery or power supply, and with the power supply and optional daisy chain, you can power up to eight other guitar pedals that need nine volt power. This is perhaps the best feature, but the easy to read and versatility of the tuning options also adds to it's prestige. The LED display screen on the TU-3 is improved from the TU-2, as it is brighter and easier to see, catering to those are using the TU-3 for live shows. The TU-3 can indeed be used for either live shows or in the studio of course, and is equally as useful in either situation in my opinion. However, the improved lights and display screen do make it easier to see in the dark during a show. The pedal will mute when you have it engaged, and there are a number of different modes that you can choose from. In my opinion, there isn't too much of a different between the TU-2 or TU-3, so either way you go you can't lose as long as you go with one of the two!