I've just bought a new Electronic tuner for my acoustic guitar. It's a "KORG CHROMATIC TUNER CA-30".

Now when i tried to tune my guitar strings using the tuner, i've noticed that my 6th string (the tickest base string) doesn't sound quite right when i play a song. Then i read the manual it says normal people tune at 440Hz. So i tried to tune at 440Hz. Now my 1st string (Low end E) doesn't sound right too when i tune it correctly occording to the meter when it flashes green.

Now im really lost. Im not good at listening and tuning so i bought this electronic tuner and hoping it will help me alot. Now with this electronic tuner it seems i still cant tune my strings to the correct tune.

I need some advice from you guys. I don't think my electronic tuner is giving me the problem. Could any one tell me how to use the electronic tuner correctly? I know i must have screwed up somewhere using the Electronic tuner. Please advice me! Thanks~