Quote Originally Posted by LouisG View Post
To calibrate a Weston meter, first zero correct it as described by Benjiboy. Then, on a bright cloudless day between 10 am and 2 pm, point it up at the clear blue sky in the opposite direction of the sun -- ie[the southern sky if you're in the southern hemisphere, north if you're in the north -- and take a reading. The needle should be at about 13.5, corrresponding to an exposure value of around 14 to 15.
Is there another method Louis, we don't get many "bright cloudless days" here in Britain, even when the Romans invaded us in 54 BC , they used to write home the weather here was crap