I am a meter hog - I freely confess. If it's a meter, at one time I had to have one. Skipping to the present, my first Minolta meter was a IIIF. I used it for a few years but found that incident metering was not my preference, and its reflection usage is clumsy. I replaced it with a Spot M, which used the silver oxide battery in this early version. That meter was burgled, so I replaced it with another early Spot M, which in turn I upgraded to a later Spot F. I bought an early View 9 (semi-spot meter) on a whim, but have yet to set it up for a non-mercury battery; a smaller and very useful meter if I get it going.