I received an old hydrometer for my birthday. It was made in Germany (D.R.G.M. No 1014519). It has a scale for potential alchohol, 2 other unlabled scales, and a therometer. It is labled as from 'Berg & Sons, Tacoma and Seattle. The instructions on the hydrometer tells me to 'float tester in the brew when ready for fermentation ... When tester sinks to letter B fermentation is finished and it is time to bottle. Legal limit of alcohol is 1/2 of 1%'
Anybody have any info on this, I would be glad to learn more. The hydrometer appears to be in un-used shape and is in original package.
Before anybody asks, it is not for sale.