I have recently purchased an older Pentax honeywell 1/21 spot meter. In taking a reading it seems to reference the lower scale 3-9 on the meter. By using this I get accurate readings. There is a upper scale through the viewfinder reads 1 0-21 and corresponds to the dial on the handle but I cannot find anything on the meter that will switch the meter to this scale. There is the trigger reading " L", a grey button reading "B" - I assume this is the battery check. There is a small set screw above the battery with an arrow pointing in both directions. Th at is it. Anyone have any answers.
Why does this meter have both a 9V and smaller battery?
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