zuikologist
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Vivitar 43 - perhaps not quite in the same league as the modern meters mentioned above, but still relatively modern and very usable - it takes LR44/SR44 batteries. mine cost $10. It has a built-in incident attachment and seems accurate against my SLR meters. Karen Nakamura likes it.
http://www.photoethnography.com/equipment.html
http://www.photoethnography.com/equipment.html