Originally Posted by jtsims21
wouldn't compromise the batch if it was properly sanitized but you wont be able to get a reading, bubbles will form on the hydrometer giving varying readings. Best way to get a sample is with a sanitized "thief"
+1 (if you have a turkey baster, sanitize and use that)
Also, hydrometers can break at what seems like anytime for no reason. If it does in primary the entire batch is shot.