Can you accurately measure alcohol content?

[ultraputa]

the batch I botteled today:

Cider

Initial density: 1.062 g/l
Final density: 0.998 g/l
Alcohol content (by volume): 8.4%

I use this alcohol calculator http://www.brewersfriend.com/abv-calculator/. It is very easy to use, maybe not the most accurate, but more than enough for what I need.

Here you are an explanation of what the online calculator does: http://www.brewersfriend.com/2011/06/16 ... r-updated/

An hygrometer is cheap and easy to use... so go for it!