Brunton TruArc 20 - Professional Compass.Further upgrades to a trusted classic, the TruArc(TM) 20 is the modified grandchild of the original 8099. Now featuring our TruArc(TM) 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