Or more, depending on how long you leave it on the radiator.
A mate of mine is a brewer (Wiper and True) and he started off doing bottle conditioned beers. He always marked them up as something around 4.5 abv, but his beer was notorious for giving you tunnel vision after about 3 bottles. I think his abv callipers were £3 off eBay or something. I assume stated abv can never be that accurate anyway, so don't know why they bother with a decimal point.
Actually if you know the original gravity (sugar content) of a liquid before and after fermentation then even rudimentary calculations using equipment from wilkos can be very accurate. Even measuring the refractive index of a fermented solution can give a fairly accurate (0.2+/-) reading.
Or more, depending on how long you leave it on the radiator.
A mate of mine is a brewer (Wiper and True) and he started off doing bottle conditioned beers. He always marked them up as something around 4.5 abv, but his beer was notorious for giving you tunnel vision after about 3 bottles. I think his abv callipers were £3 off eBay or something. I assume stated abv can never be that accurate anyway, so don't know why they bother with a decimal point.