Understand  that most tuners are set up to tune by "Equal Temperament", the modern way of tuning where an instrument will sound good in any key, but not quite perfect in any of them.
Understand  that most tuners are set up to tune by "Equal Temperament", the modern way of tuning where an instrument will sound good in any key, but not quite perfect in any of them.
Tune a Lyre
Shoe a Horse
Drill a Bowling Ball
Trim a Bird's Beak