Tune by Ear
Measure a scale purely by listening. Then check to see the numerical relations of the tones.
The voice every string sounds with, and how long a plucked tone rings.
These can be loud! Start with your system volume down very low and gradually increase.
Frequencies are listed low to high. Paste the Hz list straight into the Least-Squares or Bayesian page, or the cents list into the Playground, to compare your aural measurements to your theories.