Little glass device that looks like a thermometer with a straight
funnel at one end & graduated on the stem. About 4" long. Pour your
wine in the big end & let it drip thru the small end, flip it over &
the liquid runs out but enough remains in the tube to indicate the %.
Used mine on a merlot I made from a kit @11% & my apple anywhere from
12 to 16% and as stated above always backs up the hydrometer readings
very close.