Brunton TruArc 15 - Full Coverage Mirrored Compass.The high-visibility cling lends low-light and night time performance, and the triple clinometers system gives fast and accurate reference information for avalanche safety or earth-science field work. Overall dimensions: 4in x 2.5in x 0.6in (10.16 x 6.3 x 1.5cm)Weight: 3.2 ounces (91 grams)TruArcTM Global NeedleEver-North MagnetMap MagnifierSighting MirrorBubble LevelClinometerMagnified Readout1 Degree Resolution