"I guess that to some people, tuning is an unfathomable concept. This applies especially to autoharp players, perhaps because a duffer can play an autoharp with no understanding of music whatsoever..."

Two different issues, Joe... it is possible to strum the right strings and not be in tune, or to be in perfect tune and have no idea how to find the melody.... although with an autoharp, once in tune, it is hard to sound totally bad. I'm not sure how many autoharp players you contend with regularly, but as Leadfingers notes, it is fairly easy to be in tune using modern technology.

Even though you personally don't play an instrument, having an electronic tuner that will play a tone might be handy for both you and to 'help' others. (My 20 year old Korg will play any note thru several octaves)