Baume & Brix scale 25°-40° Baume, 45°-75° Brix. Red lines at hot and cold test. 9 3/8" long - can be used with any of our hydrometer cups, but generally either with the short cup, 1" diameter cup , or Murphy cup . Click for directions on using Hydrometers are fragile, glass instruments. They must be handled very cautiously. It is recommended that you keep a spare on hand in case of breakage.