How do you check the neck relief?

How do you check the neck relief?

I have read many blogs and watched many videos and I don’t know what to believe anymore. I would appreciate some help.

MM FAQs say: “First, check relief in the neck by holding the lowest (bass) string down on the second fret with your fretting hand, then hold it down on the 12th fret with your right thumb and tap on the string in the middle to show how straight the neck is.”

If I follow this instruction, I fret the 2nd and 12th fret of the low E and I tap on the 7th fret to check the…

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