Works as both a baseplate and mirrored sighting map compass. Magnified read out. 1° Graduations. 3 Inclinometer systems. Declination adjustable. USGS map scale 1:24k ft UTM. mile. Circle-over-circle alignment. Map magnifier. Field reference cards and lanyard. Pro: adds Bubble level for more accurate strike and dip measurements and field ref. cards for professional applications. Size: 4.1 x 2.5 x 1 .