Sunny F11 is a better bet here
If his light meter is off two stops, why not just set the asa number to compensate? Ie, film box speed reads 400 asa, set meter for 100.
The O.P could only use the meter in the snow if it reads two stops over.
How about just runing a film test to confirm the meter and adjust the ASA accordingly?
Have you checked the batttery lately?
Ireland never sees sun, I hear they get scared when it's shining.
Is there any way/procedures to check its accuracy??
I am pretty lost...and bothered.
Thanks a lot
The calibration of a lightmeter is covered in: