My friend Karl who plays guitar introduced me to the Snark Tuner, He showed me first hand how easy it is to use and at a cost of just $13 (Amazon ) owning one of these is a no brainer.
The SN-2 (red) is an all instrument (chromatic) tuner and the SN-1 (blue) is a guitar/bass tuner.
Snark SN-1/SN-2 Features:
- Full-color display
- Display clip rotates 360 degrees
- Stay-put clip
- Fast and deadly accurate
- Tap tempo metronome
- Pitch calibration 415-466 Hz
- Transpose feature (± four half steps)
- Mic/Vibration switch (SN-2 only)
Here's a link to a review of the Snark Tuner by Barry Rudolph: