But I was thinking, "Well, that's kind of a waste of a good tuning peg," so I took a bass string, put it on the guitar, and tuned it in unison, only an octave lower on the A string, so I'd still ...

The Roadie Guitar Tuner is a handy gadget that connects to your smartphone and automatically tunes your guitar. It supports open tuning and is extremely accurate, but bass players are out of luck.

Why it made the cut: This guitar tuner pedal features a huge, easy-to-read display and fine accuracy down to one-tenth of a cent in pitch. The StroboStomp HD from Peterson is a classic strobe ...