Oh, and do not try to hold the hydrometer with your teeth. My hands were full, test jar was falling...that glass is THIN! Fortunately no injuries. That was in my newbie days. I have a wine thief that the hydrometer will fit right in to, and to prevent the hydrometer from falling out by accident I slip a piece of short nylon stocking over the top. I would love to see a small rubber tip that could protect the tip of the hydrometer, somehow.