I just purchased a Wallet Calculator from Defensedevices.com. Well it’s a little too thick for a wallet, about twice as thick as a Tool Logic Card, but it’s still pretty cool. It looks like a solidly built solar powered calculator (that works) but also has the following items:

1) LED Light
2) Small utility blade
3) Magnifying glass
4) Micro phillips and flat-tip screwdriver
5) Ruler markings (inches and centimeters)

Again, neat item. You can use it as a standard calculator without ever using anythng else, but the other tools are always there.