Some tuners can tune to a dozen or more different scales,...

It would have been more accurate had I refered to "different temperaments," which a few tuners include "for historical purposes."

The current Korg OT120 offers:

Scale:
12 equal tempered, Pythagorean, Werckmeister III, Vallotti, Mean Tone Eb, Kirnberger III, Young, Mean Tone D#, Kellner

For transposing instruments it can also be set to any "key" in semitone steps, and is sensitive and accurate (+/- 1 cent) over 8 octaves.

Not something anyone really needs, and not quite what I was looking at at the time cited since the old ones have been replaced by new (cheaper) models; but "back then" one model offered about twice that many different historical temperaments and was selling for about $495, which was not too far from what I paid for both of the two (cheap) mandolins I was playing then (about $550).

John