Cammenga Tritium Wrist Compass: Provides easy on-the-go referencing for land navigation at day or night. Heavy duty black nylon wristband. Black machined aluminum casing for durability in the most demanding conditions. Sapphire jewel bearing. Easy to read 10-degree phosphorescent graduations are enhanced with Tritium Micro Lights for visibility in total darkness, maintenance free, for over ten years. Needle stabilization: Induction Damping. Climate Capacity: -25¡ F to +125¡ F. Water resistant. Hang packaged.