Mercia Blackcat
Striker
I like but that's gonna knock me back £75 and then for acoustic you would need a mic and a decent mic is not cheap.Some people swear by them. Personally, I hate them.
And ya never see pros with them.
This is a proper tuner...
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I think for a beginner on an acoustic a headstock tuner would probably do. To be honest you only need to get the bottom E string at the right pitch and then can tune manually across the 5th frets (4th fret for the second top string).