For those who prefer a more cost-effective means of navigating terrain, we offer a Phosphorescent Lensatic Compass option. This compass is essentially the same trustworthy model supplied to the U.S. Military. FeaturesShockproof, damage-resistant design.Waterproof to considerable depths.Sandproof for extra durability.Accuracy +/- 40 mils.Performs flawlessly in temperatures ranging from -50deg F to 150deg F.Uncompromised by temperature changes due to its non-liquid filled needle housing.Uses a copper induction-damping ring that slows, settles and steadies the compass needle quickly.Constructed with a powder-coated, aluminum frame for optimal endurance.