An Online Guitar tuner can seem complex at first glance but after simple explanation you will see how easy it is to use to tune your guitar.
Simply pick the corresponding string and raise or lower the machine heads until you reach the desired and unison pitch, when the tuned note becomes very close to the un tuned note, you will hear a 'wabble' or oscillating sounds as the two notes become closer to being in unison.
when the wabble stops you are perfectly in tune and can continue onto the next string.
Some online guitar tuners can be unreliable and it should be said that you get what you pay for and buying a very cheap discounted bargain online guitar tuner may have more problems than it has benefits.
Tuning a Guitar using a standard online guitar tuner
here are a standard guitars frequencies
String
Note
Frequency
1 (Highest)
e'
329.6 Hz
2
b
246.9 Hz
3
g
196.0 Hz
4
d
146.8 Hz
5
A
110 Hz
6 (Lowest)
E
82.4 Hz
An electronic tuner is a device used by musicians to tune instruments. A musician plays a note, and a display (a needle, an LCD simulated needle, LED lights, or a spinning translucent disk illuminated by a strobe light--the tuning of a sample note is determined by whether the markings on the disk appear to drift to one direction or the other, or to stay steadily in place) tells the musician whether the pitch of that note is lower, higher, or approximately equal to the desired pitch. Some models try to automatically detect which pitch is intended, others require the musician to specify the target pitch, and others allow the user to choose between these two modes. Some models allow the user to select reference pitches other than A440. Most electronic tuners only allow tuning to an equal temperament scale. These are available in a variety of makes and models and are mainly used to tune guitars.