Equipped with 7 Tritium micro-lights, providing continuous illumination for over 12 years. Shockproof, damage-resistant design. Waterproof to considerable depths. Sandproof for extra durability. Accuracy +/- 40 mils. Performs flawlessly in temperatures ranging from -50F to 150F. Uses a copper induction-damping ring that slows, settles and steadies the compass needle quickly. Constructed with OD powder-coated, aluminum frame for optimal endurance. Green synthetic belt sheath. Bulk packed.