Hello - on the ways to use electronic "tuners..."
If you have a meter, you can indeed use a table of "cents" to
get various unequal temperaments.
However, the resolution of most of those meters is very poor;
a "full scale" range of =/- 50 cents is not uncommon.
Since in getting most common "well" temperaments the distinctions
are of the magnitude of a half to a single cent, trying to read
those tiny differences on those vague meters is frustratingly
On the current high-priced ($270?) Korg, the meter has a second
setting for +/- 25 cents, which is better. You can almost read
the meter to the nearest cent.
However, my Los Angeles colleague pointed out that the circuitry
which drives the meter seems to be inaccurate to about 2 cents;
if you tune carefully to the tone the machine makes, then read
the result with the meter, it's usually not dead on (mine reads
one to two cents flat.)
I find I use whatever machine I'm using mostly as a variable
tuning fork - setting the first note in the temperament to any
pitch I may want (such as setting g# two cents sharp so that
"a" of Werckmeister III will come out on the button). The
flashing lights are also good for a quick ET in the presence
of the orchestra - not to mention for impressing the players
that you have fancy equipment!
That old Tuners Supply machine I mentioned has a couple of
pitches within the octave that always tune wrong. But its LED
readout is sensitive to within a quivering 1/0 cent or so, and
I can always enter a correction to get the notes where I need
them, whether for ET or for an unequal system.
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