Troika's Construction Pen is a ruler, a capacitive stylus 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 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.