Compass for anywhere-with

The compass is pleasantly flat and therefore always in his pocket unnoticed with the move.
When selecting was important to me that it is not too small to allow a sufficiently accurate bearings.
Exposed part and the flat bottom surface are sufficiently thick and rigid material from.
The acrylic case is so far little scratched, but where do I avoid it, to put in the same bag etc. Key.
The externally mounted highly visible 5 degree divisions are even after long use all nor how newly available.
The North / south orientation can be reached just by a parallel arrow.
The needle is fluid damped and after 3-4 seconds at a standstill.
And with the carabiner or even with the hole on the housing end it can be attached to a keychain also eg.
A deduction of points there, because the display quite sensitive to static electricity and a capacity-gauging device or a straight edge of the housing missing.
However, the charge will disappear fairly rapidly by itself and for accurate direction finding you can attach up something, for example, 2 small adhesive dots or a thin plastic needle.