The "Alcoholmeter" is used to measure specific gravity of liquids and thus sugar content for wine and beer makers. Proof and Trailles hydrometers are calibrated for determining alcohol content of distilled spirits (vodka, brandy, etc.).
30 cm (12 in.)

To determining the alcohol content use the alcohol scale on the hydrometer. Take one reading before fermentation. Take the final reading after fermentation is complete. E.g.

The difference between the first and last reading gives you the percentage of alcohol in your wine, e.g. First reading is 11% (S.G – 1.085). Final reading is minus 1% (S.G – 0.992). The difference between these readings is 12%, which means your wine is 12% alcohol by volume.