I have 3 that I use.
I bought a Conn Strobe tuner many years back. I used that tuner through so many different bands. I had it plugged in to the line out of my amp so I could check and fix things in the middle of a song if needed.
One night, we were hosting a music competition at the club where we were the house band. One of the contestants left a cheap tuner backstage and never returned to get it. After a few weeks, I carried it home. It's in one of my guitar cases.
Finally, the POD2 has a built in tuner.
All 3 work exceptionally well.
Music Lover said:
Don't know about everyone else but sometimes my guitar seems better in tune than other times and that's even after using a tuner.
You should recheck your tuning because it's likely that one string slipped or never got to pitch properly. When that happens to me, I rework the tuning and always find one string slightly off.