Plastimo Handbearing Compass. Iris 50. Works as a handbearing and traditional compass. Good protection from hard knocks and superb card stability. 1 degree graduations provide outstanding legibility. A prism projects the reading of the bearing to infinity, contributing to more comfortable operation. 20 degree field of view. 12 degree clearance. Pivot and hard stone provide long live and excellent shock resistance. Soft bottom cell prevents the formation of bubbles and leaks. Built in photoluminescent lighting, maintenance free, impervious to corrosion. Operates without a battery or radioactive tritium. Assorted colors (yellow and orange).