this one's my uncles he gave it to me. I don't have a light meter that goes with it (mini shoe mount meters would be my preference)
Can anyone help? I don't like selenium meters since I've heard reliability issues.
thanks in advance.
David.
(I anonymous all my questions since my cousin asked some weird *** question in my account)
Added (1). link to pic:

and

Read more: Light meter for petri v6 ii?