How do i use a digital guitar tuner?

r asked:


I just a bought a electric guitar and i am a newbie… i don’t know how to use it to tune..the instruction manual is nothing much of a help.

please help me… it is a cherub wst-520gb

then there are 3 light buttons on top
and
1 button for item/flat
and another called CALIB

a hole for input and output and where should i connect my guitar to?