The effects are measured in Scoville Heat Units (SHU). There will be a label on the can that will tell you the amount, go for the highest one. There's a lot of junk out there. Oh, and OC spray has a shelf life too, look for an ex date.
Seriously, I think pepper spray is for pussies. Real men carry fire extinguishers around, not small cans. Might have a problem finding a purse that is big enough, though.
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