Brunton TruArc 20 - Professional Compass.Further upgrades to a trusted classic, the TruArc™ 20 is the modified grandchild of the original 8099. Now featuring our TruArc™ global needle system that will not lose polarity and resists magnetic interference better than any competitor. Overall Dimensions: - 4.1in x 2.5in x 1in (10.4 x 6.3 x 2.5cm)Weight: - 3.6 ounces (102 grams)TruArc Global NeedleEver-North MagnetMap MagnifierSighting MirrorBubble LevelClinometerMagnified Readout1degree Resolution