Hey everyone, I'm currently fermenting my first lager, an octoberfest, and I'm wondering when to do the diacetyl rest. It is currently sitting in my primary at right around 55 degrees and has been fermenting now for 9-10 days. The airlock activity has slowed but not stopped. I understand that I need to take a hydrometer reading, but I really don't want to open the bucket for a sample until its necessary. Any advice would be appreciated.