When tuning by making the open strings beatless, it's useful to know that tuning an interval until the beats disappear isn't the same as tuning to the equal tem

When tuning by making the open strings beatless, it's useful to know that tuning an interval until the beats disappear isn't the same as tuning to the equal tempered standard. A just 4th (4:3 frequency ratio) is about 2 cents flat of an equal tempered 4th, and a just major third (5:4 frequency ratio) is about 14 cents flat of the equal tempered major third.