All these people saying the battery life is bad must be purchasing dead batteries

The battery it came with lasted a couple weeks or so, but the replacements have been dead after one use

Sick of trying to get the fiddly little battery cover of every other day to change the rapidly depleted battery

One last thing, when it goes back and forth and you 'think' the string is in tune, (I use mine for guitar), then it could be a bad battery, or your string just isn't in tune, strings do tend to wobble in pitch if not precisely tuned