The Clip Ruler from Midori is a very slim ruler with its own clip that can be attached to paper as well as notebook covers.
The template allows you to customise your notes and diaries and assist your planning. You can even colour in the motifs according to your mood or to suit the schedule.
It also makes a great bookmark!
Measures: 104.5 mm x 34mm x 1.5mm
0.3mm in thickness.