Frequency Accuracy

[John Lillico, RPT]

I found the following in the archives.

 "Frequency accuracy << If I find one person with an SAT and one with an 
RTC and the A-440's aren't the same, who's right? >> Pick up the phone 
and have your SAT listen to the dial tone. As far as I know, it is a 
square wave 440 cps audio signal. Works in my area anyway. If it isn't 
perfect, it is at least good enough. B. Simon Phoenix "
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My question. My Accu-Tuner measures the dial tone at 2.0 cents flat on A4. If the dial tone is correct, how does one correct the Accu-Tuner for it is indeed calibrated at turn on? If uncorrectable, do I then offset everything 2.0 cents sharp before taking FAC's?

John Lillico, RPT
Oakville, ON, Canada