by krt » Monday Jan 13, 2014 10:37 am
Short answer: Yes.
You can make very fast checks of your wort and run-off during the process. There's no having to put cylinders of hot wort in the freezer to bring the temperature down (that's how I used to do it anyway). Three drops of wort quickly come down to room temperature, and you're good to measure. Is it 100% necessary: No.