BELL & HOWELL SELENIUM EXPOSURE METER MODEL 76 SUNOMETER/167394
$5.27 (-40%)
Pocket size light meter with scales for 6 different ASA settings.
ASA ranges:
10
16
20
25
32
40
Exposure is selected by turning a knob on the side to find the correct ASA rating for your sim. Then aperture is read off of a scale.
There is no setting for shutter speed. My guess is that this was set up for early movie cameras that had fixed shutter speeds.