Planet Waves Desktop True Strobe Tuner

The purest input tones yield the best results. Here's how to achieve optimal tuning:

Pluck the string with a light to moderate stroke. Strings will usually go slightly sharp right after the initial attack. Excessive or heavy plucking of the string will increase this effect. Give the string a second to "settle" before tuning.
Pluck the string with the flesh of your thumb. This will yield less harmonic information for the tuner to analyze then using a pick.
Turn the tone knob of the instrument down. This again will roll off high-end harmonic details and input a more fundamental tone.
Lower the volume of the guitar 30% to 50%. This will usually yield less harmonic detail and input gain.
While coarse tuning look at the entire display for movement. When the action of the LED's begin slowing to a halt, look at the leading LED for movement and continue to tune until the LED stops in place.

Planet Waves Desktop True Strobe Tuner Features:

Durable and reliable
Spans virtually all tuning applications
Accuracy of +/- .1 cent
User calibration from A435Hz to A445Hz
Rotary LED indicates pitch
Oversize note indicator
Built-in microphone
1/4" input and output jacks
Powered by 9V battery (included)