Comment on What you get when you search for “Guitar Tuner” on BingComments−byron_fast11yNeat. Or just use a (real) phone's dialtone, which is E.−Rebellos11yNot necessarily. It depends on the installation and does, usually, contain 2 tones. For instance - https://en.wikipedia.org/wiki/Precise_Tone_Plan - none of two frequencies used in NA's dialtone is E.−byron_fast11yAh well it always worked for me... may have been a case of "close enough for rock'n roll" though.
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Neat. Or just use a (real) phone's dialtone, which is E.
Not necessarily. It depends on the installation and does, usually, contain 2 tones. For instance - https://en.wikipedia.org/wiki/Precise_Tone_Plan - none of two frequencies used in NA's dialtone is E.
Ah well it always worked for me... may have been a case of "close enough for rock'n roll" though.