hi, I am thinking of getting a tuner for my acoustic guitar...any recomendations?? I have did some search and it seems like mostly uses those flat type of battery,how long will the battery last??actually i kind of prefer those using AAA batteries as they are easily available.....actually my purpose is not really on tuning as i am still unable to hear the differences...its more for the stress on the strings....cos if i were to change the strings after some time,i might not know when to stop tuning the nuts...:mrgreen: