Bewi Zoom Spot meter

Hi all,
I just picked up the ancient Bewi Zoom Spot meter.
Wondering if anyone had a few tips on its usage.
Anything to watch out for. Flare?
Seems like a great meter.

Thanks.

Good luck finding the proper mercury battery for it. They haven’t been made for decades!

Batteries aren’t the issue, the meter has a circuit compensation, which can take the newer higher voltage batteries.