The Korg I use in my shop is the Korg DT7(at least I think that's the model #).
As for Feitenizing, it's actually a combination of changing string length(shifting the nut) and reintonating the bridge so it's actually a few cents off. There are only a handful of tuners capable of being accurate to the cent enough to feitenize a guitar. For an "accurate" tuner, aside from a Peterson tuner, the next best thing is the Korg DT7.
Note: feitenizing was only used as an example to indicate how accurate the tuner was.
Personally, I tune guitar that are not feitenized a little sharp on the highs and a little flat on the lows for a similar effect to feitenizing(something I learned from
Eric Johnson before I discovered feitenizing).