The Diana LT-10 Auto Tuner is a basic electronic guitar tuning device. Though discontinued, it is still popular among guitar students. The tuner consists of a power button, a built-in microphone to pick up sound and six LED lights that correspond with each guitar string. The downside to this type of tuner is that it does not allow for alternate tuning types. It is specifically designed to tune your guitar to standard tuning (E-A-D-G-B-E). The tuner is perfect for the beginning guitar player looking to acquaint herself with basic tuning techniques.
Place your acoustic guitar comfortably in your lap, and set the Diana guitar tuner about 18 inches out in front of you.
Turn on the tuner, and test it to make sure it is picking up sound from your guitar. The LED lights should light up as you pluck the strings on your guitar. If not, change the 9-volt battery inside the guitar tuner.
Pluck the low E-string (the thickest string), while turning the guitar's corresponding tuning key right to tighten the string or left to loosen the string. Tightening the string produces a higher pitch, and loosening the string a lower pitch. Adjust the string until the low E LED light flashes green.
Repeat this to tune each string on your guitar.