You will get - 2 pieces of ALCOHOL HYDROMETER
A glass alcohol meter (SPR) is designed to determine the strength of alcoholic beverages in your glass. Agree - it's very convenient. The practicality of the alcohol meter is due to the wide (from 100 to 800) range for determining the strength of drinks (from the first to the afterbirth), except that it will simply drown in pure alcohol.
The accuracy of the alcohol meter is guaranteed by the technology used in the manufacture and the design itself. When determining the strength, put a clean and dry alcohol meter in a solution (alcohol, vodka, moonshine, but not in wine!) To the mark of the estimated strength and allow it to float freely without touching the glass wall.
The line of contact of the liquid with the rod of the alcohol meter will indicate the strength of the drink in degrees. Readings should be taken along the lower edge of the meniscus at a temperature of 20 С, because at a different temperature the readings will not be entirely accurate.