I use a Fluke 52 with an 80 PK-22 immersion probe. http://www.transcat.com/catalog/productdetail.aspx?ywccywywc=c1r34ew&AccessoryInfo=1&itemnum=80PK-22
I work in a calibration lab and calibrated it between 140 and 170 and have it accurate to more than 1 degree F. I also run into the same...