I recently acquired an apparently unused Spiratone Model 200C Enlarging Meter/Computer. The instructions for the color attachment were in the box, but not the basic instructions. Does anyone have an instruction manual they could share? I suspect the thing isn't worth the trouble, compared to test strips, like every other enlarging meter I've tried, but I'd love to try it out--I have nostalgic fondness for Spiratone stuff, something I probably share with other US photographers of a certain age.