A-440 Tuning Reference - this is the industry standard for tuning modern instruments. The "A" stands for an A note, and 440 refers to the speed of the vibration that leads to what we consider a perfect A note. The reason is that all sound is vibration, and the speed of these vibrations produces the pitch of the sound. Frequency (or vibration speed) is commonly referred to as Hertz, or Hz.
As you tighten your guitar strings they will vibrate faster producing higher tones. When you loosen them, they vibrate slower producing a lower tone. The idea is to match your A string perfectly to the A440 reference tone.
Tuning Reference Tools - we used to use a standard tuning fork to tune guitars and other instruments, which is a metal bar that splits into two bars that vibrate at 440hz and produce a reference note when struck.
Digital tuners that read the frequency have gotten very accurate and quite inexpensive as well, so that will be the right tuning equipment choice for almost everybody.
Comparative Tuning - this is a method of comparing the tune of one string to another, and is useful for tuning if you can get one string in tune using a reference note. It is also quite useful for checking your tune quickly and easily.
Or you can use some site to tune your guitar in standard, etc.
here are some sites
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