[TimR]

On Friday, May 24, 2019 at 7:47:32 PM UTC-4, Mike Rivers wrote:

They're accurate, but most don't have good enough resolution to get
right on pitch, but, as we say in folk music, they're good enough for
folk music. They're of no use when there's a fixed-tuned instrument and
everyone else has to tune to that. That's where a Strobe tuner or
something that displays cents off pitch is useful.

Wait, people can't hear when they're out of tune? Can't tune a pure unison by ear?

If that skill is missing seems like a strobe tuner will get at best one note in tune.

Before electronic tuners sometimes a group would be so far off pitch, the individual instrument couldn't get in tune. Now that the center pitch is more standardized, instrument limitations become less important.