No matter how great your gain staging, how shimmery your reverb tails, how accurate your sweep picking, everything is lost unless you keep that guitar in tune! The tuner pedal is the most important pedal on your pedal board, no matter how good your ears, stages get loud, and it can be very difficult to hear the tuning of your instrument. Tuners are especially important for artists that chop and change between different alternative tunings such as drop D or DADGAD. Polyphonic tuners such as the Polytune 3 from TC Electronic allow you to make the tuning process more efficient because provide a reading for multiple strings at once. If you don't have a pedal board, a clip on tuner might be the best option. These small handy devices are sensitive to the vibrations that travel through your guitar, rather than the signal from a pickup.