Open it and measure…it’s no big deal. I’ve done it for years using a sanitized turkey baster. As I’ve often said, if you can’t take a gravity sample without screwing up your beer, maybe you should consider taking up knitting for a hobby! 
Open it and measure…it’s no big deal. I’ve done it for years using a sanitized turkey baster. As I’ve often said, if you can’t take a gravity sample without screwing up your beer, maybe you should consider taking up knitting for a hobby!