Guitar Tuner description

Bass Guitar Tunings is simple and easy to use bass tuner app, for Smartphones & Tablets. Bass guitar tunings includes Standard Tunings for 4, 6, and 8-string bass, with 6-string guitar tunings. Good quality sounds.

It is an App which tells you which note you are playing on the Guitar.
What I need you to find, it is the Actual Detected Main Frequency Double or Int.
If I would be playing an A (440 Hz), you would have to find the Int or Double which contains that "440" number.