Cheapy, little crappy one that I stole from my daughter. My cheapy 20+ year old Korg finally became unreliable after it fell on the floor for the 153rd time though I still use it at home. Sometimes you gotta whack it a few times to make it work. I don't need no fancy tuner. These cheapies are close enough for blues. Or, close enough for folk-rock.
Just FYI, I had a rack mount Korg for years. I offed it in favor of the Boss TU-2 that I have now. I find that it's just as acurate and much easier to use.