TruArc 7 mirrored compasses feature an inclinometer for measuring apparent tree heights and gauging avalanche danger, and can be used as a sighting tool for even more accurate headings. TruArc Global Needle system and tool-less declination compensation ensures worldwide compatibility. Overall Dimensions 2.9 x 3.9 x 0.8 Weight 2.2 OZ 2 Degree resolution Sighting mirror Clinometer Global needle