I still have a Weston Master V which I purchased in 1968 or 1969. It worked well when new, but the silicon cell gave out and it would, as others have noted here, only read weakly. I sent it to these people: Link and it has worked exceedingl well since. I have compared it to two digital meters, on a new Sekonic, and it agrees with them. In practice, it gives excellent results.
I have a Zeiss Ikophot that is not so lucky.
The Western Master V has a Selenium cell, light meters with Silicon cells need a battery to power them.