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 $US25 HandSpan keychain that manages to squeeze an adjustable spanner 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]