I have a handheld refractometer (model # RSG-100ATC) that I use to take gravity readings pre-fermentation. Aside from wasting less beer for measurements, I especially like the ability to monitor gravity during the boil. The problem I have recently run into is that lately it seems the gravity readings during the boil come in much lower than after the wort has cooled and is sitting in the fermentor. For instance, yesterday I brewed a Helles that measured 1.048 at the end of the boil (my target) but once it was chilled down to 50 degrees and ready for yeast it measured 1.055. This has happened a few times now. Am I simply overestimating the "automatic temperature correction" feature of the refractometer and should chill wort down before taking readings from the boil kettle? Anybody else run into this problem?