Troika's Tool Pen is a spirit level, a ruler, a screwdriver, a capacitive stylus and a ballpoint pen. With the replaceable capacitive stylus, you can doodle on your iPad without it feeling like you're finger-painting. The screwdriver attachment is stowed away safely under the stylus when not in use, and the stylus itself can be attached to either end of the pen so it doesn't get lost when you're busy driving screws. Why, you might ask, do I need a screwdriver in my pen? 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. 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 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. 151mm long, 10mm barrel width, weighs 38g.