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Leitz rouy photrometer
Leitz Rouy Photrometer, S# 7548, 115V, 0.7 Amps. In the front is a switch- On/Off and a control knob. When turned on and this knob is turned the meter reading increases/decreases. There is also a large knob on the side with different lenses marked A, B, 640, 610, 580, 550, 535, 520, 490, 460, 445, 415. When the instrument is turned on the meter responds to both control knobs. On top the sample tube is broken, only the bottom half is good. Dimensions- 9 x 15.5 x 6.5 high. I do not know how to test the unit for proper operation.
