Thanks AJ. That helps a lot. I figured +/-0.05 would be sufficient for mash pH, but I didn't plan on doing other things with it that require more accuracy (e.g. detecting autolysis). That said, I might as well just spring for a more expensive meter with better accuracy and maybe in the future I'll want to do that stuff.
Looking at the Hanna website, the Phep 5 is also accurate to 0.05, so I guess that one is out.
Down in the 0.01-0.02 range there is the Milwaukee MW102 , HM Digital PH-200, and the Hanna HI 98111.
My thoughts on these are:
Hanna HI98111:
This one has a pre-amplifier in the electrode to reduce noise. Therefore, when you replace the electrode, you also need to replace the other electronics as well. I'm not a big fan of that (since you have to throw away perfectly good electronics). It also makes a replacement probe ~$50, which pretty much eliminates it for me (unless someone feels strongly about it).
HM Digital PH-200:
At $80, this is the cheapest one in the 0.01-0.02 range that I was able to find. It almost seems to be too good to be true. This brand is also the one that I've heard the least about. With all that in mind, I'm not leaning towards this one.
Milwaukee MW-102:
This one comes with a separate temperature and pH probe, which I like. It allows me to take temperature measurements of my mash and other things without degrading the electrode. The temperature readings are probably more accurate than my floating thermometer. The pH electrode is also a BNC type, which is a good thing for replacement. From what I've read, I think Milwaukee seems like a reliable brand, but I'm not 100% sure. The meter is also accurate to 0.01 or 0.02 (I see conflicting information on their website). I'm leaning towards this one.
Any thoughts?