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Polytune not very accurate? Any others having this issue?

I use a Sonic Research Turbo Tuner for my bass, which I've had for a bit over a year and have absolutely no complaints about. As a sales pitch: it's perfect. Better and more accurate than a Korg Pitchblack, Boss TU2 and TU3, and even the Peterson Strobostomp. If you care about the precision of your tuning, just go buy one asap.

So, back on topic: Today at a rehearsal, my guitarist sounded kind of out of tune so I took his guitar and reintonated it quickly, using my Turbo Tuner. Strumming chords up and down the fretboard, sounds perfect, no issues. However, we plugged the guitar back into his TC Electronic Polytune pedal and three of the six things were coming up almost a quarter sharp, where as they were perfect on my Turbo Tuner. Upon close inspection, it appears the Polytune pedal was set on completely stock settings in chromatic mode so I have no idea why it would read so far off.

I started thinking about how a bassist in a prior band I was playing with also had the Polytune and how he ALWAYS sounded a little bit flat to my ear, all the time. I have pretty sensitive hearing when it comes to tuning but both of these instances are really throwing me for a loop on this product.


TL; DR: two instances I've had where two different Polytune pedals were both very inaccurate compared to other tuners.

Has anyone else ever owned a Polytune and had similar issues? Am I doing something wrong? I know these things generally get great reviews and I always thought they were decent, but the only two experiences I've had with them are the two listed above, both of which yielded a huge gap of accuracy compared to even say, a Boss TU2.
Or am I just doing something wrong? Is there some mystery calibration setting that my guitarist should be bypassing that got turned on by accident? Any tips?
 
1. Is there a way to reset/recalibrate the Polytune? Maybe the two pedals you mentioned both got thrown-off, somehow.

2. Pretty sure it's illegal to mention the TU-2 and ST-200 in the same post, not to mention the ST-300. Why do people still use the TU-2??

3. Someone needs to tell Sonic Research that polyphonic tuning is where it's at. They would make soooooo much money if they jumped on that bandwagon.
 
By any chance are you guys in different reference pitches? E.g. A=440 or 442 or 447...

This would be my guess. My old guitarist had a StroboStomp and my Polytune gave me the same pitches. I have never had an issue with mine.

As far as using polytuning goes, I have used it on my 6 but I am not sure if it is actually that accurate but it tends to be darn close. On a side note, did you know you can switch the polytune mode to Drop D? Confused the hell outta me when I accidentally did that.
 
Are you tuning the bass in poly mode? I don't know about the full size, but the clip and the mini only work in chromatic for basses.

Yes, sorry I was not clear. I have never really tried with my 4-strings but it did appear to work with 6. You can strum all the open strings and it will show 6 meters being read just like a guitar. Mine is a full-size and not a fun size, I don't know if that matters. I would only use the feature to see what strings were off though, I would tune individually as needed.
 
They are good enough for live use and are absolutely bullet proof. So I will use my TU-2 until it breaks... which means forever ;)

I have a TU2 and a poly tune mini. I tested them together once when I first got the polytune and didn't have any issues, but haven't checked recently and it's been a year or two at least. But damn, I've been using that TU2 for about 10 years now and it's never been a problem, and I bought it used.