Characteristics:
The main elements of gauge are test - tube and floater with scale 0-85% of alcohol content. These products are calibrated in 20 - 21°C.
Usage :
Fill the test-tube with small portion of liquid so that floater drifts. Floater can not touch container's walls.
Every country has its own legal regulations governing the manufacturing of ethyl alcohol, wine products, and spirits, introducing them onto the market, and regarding sanctions for non-compliance.