Just mentioned Sanwu as Micheal is set on the number 100mw.. and Sanwu meters them with a accurate meter.@Michael3
Instead of posting two or three times in a few minutes time, try using the edit icon on the bottom right of your last post. You can then add information instead of triple posting....which is highly frowned on here.
The only difference between the 50 mW and 100 mW lasers are the driver current. You could buy these for as little as $5.00 on eBay and find one that is outputting more than the others. I still don't get why people spend extra money to get these same lasers from Sanwu, or anyone else, as they are the SAME lasers. If you want to get a higher output, pot mode it yourself.
As far as taking these lasers apart, they most likely break as everything is glued in from mass production.
Again, I just believe the one you ordered from "laserpointerstore" is the exact laser inside and just metered a higher. They might even use their own "Pocket Meter" they sell which might give you an idea of the lasers power, but their pocket meter isn't to accurate in measuring little intervals of mw's and might vary by 50mw or 100mw more.
Then again, like mentioned 80mw or 100mw isn't a big difference and you should really consider like Paul said to get a bunch off ebay for $5 or $6 and if its for astromony use a plastic tie for the switch and use the key at the back for off and on..They most likely have the same one you ordered also on ebay..