$155.00

Heavy-duty impact and corrosion resistant aluminum housings are flat and compact with no protruding or adjustable parts. Needle cards are immersed in a clear, low-viscosity liquid damping for smooth, vibration-free movement. Needle cards pivot on polished sapphire bearing. Azimuth models have a small backsight and larger foresight, both graduated to 1/2°; estimates to 1/4°. Quadrant models are graduated in 1° units. Cotangent table printed on back. Balanced for use in Northern hemisphere. Dimensions: 3″ x 2″ x 9/16″.