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The Silva Expedition 4 Military Compass is a classic baseplate with almost all the scales you'll ever need in the palm of your hand.It has a magnifier for detailed map reading, milimeter and inch scales for all types of map.Great for walkers, trekkers and anyone who needs more from a compass.Silva 1-2-3 System baseplate compass Compass capsule / needle Magnifying lens - Yes Declination adjustment: Decl scale in capsule Active time after activation in light: 4 hours (luminous compound - Tritium compound 80 mCi) Silicon friction feet Patented red/black N/S lines in capsule Available graduations: 6400/360 (360 inside the capsule), 6300, 360 Resolution degrees/mils: 2 / 50 Measuring scales on base plate in mm, inch UTM position plotting scales (Romer scales): 1:25k, 1:50k, 1:40k Settling time from 90 degree angle within +/- 3 deg: 2.7 sec Settling time from 90 degree angle to complete rest: 5 sec Accuracy: +/- 1 degree (17.8 mils) Waterproof: IP68 - (more than 100 m) Altitude use: 5000m@-15 C Impact resistance: 30g in XYZ directions and free fall from 1,5 m height into gravel Temperature operating range: -40 to +60 C Material: Acrylic Size (mm): 126 x 60 x 10 Weight: 36g