It can provide everything from weather forecasts to stock quotes, but can that smartphone in your pocket help you unscrew a nut and bolt? Certainly not as well as this $25 HandSpan keychain that manages to squeeze an adjustable wrench into your other pocket.
Small enough to hang off your keys without being cumbersome, the HandSpan also features Phillips and flat-head driver bits for dealing with screws, and it doubles as a small, but accurate, set of calipers. Given its size and lack of handle, you probably won't be able to generate enough torque to loosen rusty old bolts. But those with a MacGyver mindset probably still won't mind having this within reach. [True Utility via Notcot]