Yes, your ears are the best "gadgets" extant, and are only supplemented by all the gizmos and do-dads. Use of tape measures and lasers help to narrow down things in order to lay down some kind of baseline.
Measurements and microphones can "hear" things you can't and still won't be able to after using them simply because we're all deficient (or overly sensitive) in some aspects of the frequency range, so good luck with that.
In the end, it will always be your ears that decide.
All the best,
Nonoise