Fermented hydrometer (with Oechslescale) degrees divided by 8 = % volume of alcohol.

Fermented hydrometer degrees on the plus scale Fermented hydrometer degrees on the minus scale Total fermented hydrometer degrees

59 20 79

79 divided by 8 = about 10% alcohol by volume

159
900
1 059 grammes

59 grammes over 1kg = 59 hydrometer degrees

80
900
980 grammes

20 grammes under 1 kg = minus 20 hydrometer degrees