Troika's Liliput Construction Tool Pen in red is - quite astonishingly when you consider its size - a ruler (admittedly not a very long one), a capacitive stylus, a slotted screwdriver, a Phillips screwdriver and a ballpoint pen.

With the capacitive stylus, you can doodle on your iPad - or other electronic devices - without it feeling like you're finger-painting.

Twist the front section to retract the refill when not being used for writing. This section also pulls out of the pen to facilitate refilling when necessary.

As the barrel is made from brass, the pen has a reassuringly solid feel to it, and it's build to last!

Hexagonal barrel won't roll away when not in use and is comfortable to hold when writing. Measures just 82mm long and weighs a sparrow-like 14g.

Fitted with a black refill. Supplied with two spare refills.