Tools that help you with digging trench or something else.

Cammenga Phosphorescent Wrist Compass (2009)
(Description copied from official webstore) Day or night, the Cammenga Phosphorescent Wrist Compass is always ready to provide accurate, hands-free land navigation in the most demanding conditions. When light conditions become dark, the 10° graduations become luminous, making the compass face easy to read. Features: Machined aluminum casing for durability. […]