Set the pressure, press it once, walk away — it stops on its own. Seventeen cylinders, a work light and an SOS mode, and it lives in the boot rather than the garage.
A waterproof camera on a semi-rigid lead that streams to your phone. Down a bore, behind a dashboard, or into the gap you would otherwise take the whole panel off to see.
Measures a wall on your own, in a second, with no tape to hold at the far end. Area and volume come off the same button, which is the bit you use more than you expect.
Stainless, 0.01mm, and it switches between millimetres, inches and fractions. The tool you did not know you needed until the first time a bolt was nearly the right size.