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I picked this up a year ago at a camera shop last year for 10 dollars used... seems to be more then a few of these around.
I couldn't figure out what I needed it for, as a camera can do it for me, but now I do.
If there is an indoor event, I use this handy light meter to tell me what kind of shutter speeds I can get without a flash, and figure out if I need a flash or not to stop action. I really don't like to use a flash if I don't have to, so this meter lets me decide ahead of time which to choose.
If I had more then one lens, then it would also help me choose the min F stop I need.... for example F2.8 or 4.5.
sometimes I go first without my camera equipment and meter the light. If flash is out of the question, and the light meter tells me there isn't enough light to stop action with the lenses I own, then I don't bother and leave the "heavy" equipment at home.
cheers
randy