Troika's Construction Profil+ Tool Pen is a multi-tasking ballpoint pen. It writes, of course, but it's also a spirit level, a ruler, a screwdriver - Phillips and flat-head - a capacitive stylus, a 1.5mm Allen (or hex) key and a tyre tread depth gauge!

The screwdriver, Allen key and tyre tread gauge attachments are stowed away safely under the stylus when not in use. With the capacitive stylus, you can doodle on your iPad without it feeling like you're finger-painting.

A ruler is one of those things that's rarely around when you need it, and with the spirit level, at least you'll know that the desk is level if you can bring yourself to put the pen down. The tyre tread gauge has two measurements: 1.6mm - the legal minimum tread - and 4mm.

Instructions on how to change the refill are included with the pen. As the barrel is made from brass, the pen has a reassuring weight to it as well as being nigh on indestructible!

Hexagonal barrel won't roll away when not in use and is comfortable to hold when writing.

Refill with D1 multipen refills.

160mm long, 10mm barrel width, weighs approximately 50g.