Here's another method I use:

Get the 3rd string up to pitch and tune the D string to eliminate any beats between it and the G; same with the A to the D and low E to A. Then I'll use the low E harmonic at the 7th fret and tune the 2nd string to match. For the high E use the low E harmonic at the 5th fret.

Basic stuff but it may be useful to some.

Fred