I'd imagine most of the clip-on tuners would be fine. I like the TC polytune. Any phone tuner app should be able to play a 220 Hz tone you can use for the open A string by ear.
uhm I guess i was not too specific, I meant the tuning heads, the thing that you turn to tune, probably should edit the post
I did pause for a moment wondering about that before commenting! ๐ There was another thread here about tuning machines on an accoustic. Suggestions from there probably apply here (Goth, Graphtec, Schaller).
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