Has anyone, or does anyone have suggestions on how to mark the inside of your kettle to see volume? Without causing issues with crude and bacteria, etc. I’ve seen some kettles with it laser etched in, but mine do not. With boil off and what not I’d like to hit my target volumes better. Trial and error helps narrow it down, but never the same. I have looked at adding fluid sights to the kettle, but I want that to be my second option as it costs more and one more thing to take apart and clean.