Usually scorpions with weak poison have much stronger front pinchers or chela. I doubt that many are as strong as a crayfish. I have never been pinched by an emperor scorpion though. I would expect that they are probably stronger than a crayfish of the same size.
http://en.wikipedia.org/wiki/Emperor_sco...
Also which has a stronger shell. Has anyone been pinched by both and want to tell me
