How to tune half-step down

Found a tab to a song I want to learn that says "All guitars are tuned down half a step (Eb)."

Any ideas on how I tune my acoustic a half a step down with my electronic tuner?

Yup...chromatic tuners are pretty cheap these days. Musician's Friend has a
"Quik Tune" chromatic tuner for $12. I bought one for a friend for
Christmas last year, and it works fine.

BTW....unless you're trying to play along with the record, or there's an issue with a singer, you don't really need to tune down a half-step to learn the song.

In the immortal words of Homer Simpson:

"D'OH!!"

I just looked at my Korg GA-30 Guitar/Bass Tuner and noticed that one of the buttons is marked "flat"..... "Gee, I wonder what that does," I thought to myself. And Self replied, "It tunes you to a flat, you idiot!"

great.

With open strings, no....but it's easy enough to do. Fret your low E string at the sixth fret and tune to the A on your tuner. Do the same same on the
A string and tune to D, on the D string and tune to G, on the G string fret the FIFTH fret and tune to B, and back to the sixth fret on the B string and tune to E. Tune the high E by ear to fifth fret on the B string....and there ya go.
And as an added suggestion, try weaning yourself away from that electronic tuner...