Archive: Liquid-damped magnetic steel needle and long-lasting precision pivot. Built-in magnetic declination screw and magnifying lens. Sighting mirror with luminous points. Additional sighting hole. Clear protractor base is imprinted in red and features skid-proof rubber map feet. Clinometer measures heights and slopes to ±90°. Lanyard and declination tool included. Baseplate Dimensions: 2-1/2” x 3-13/16”. Features a magnifier in the base, 1/20 inch scale, a mm scale, plus 1:25,000 and 1:50,000 map scales.