This Hand Bearing Compass is accurate, durable and easy to use day or night. The colorful sturdy rubber housing protects the compass and makes it easy to find when needed. Superior damping gives quick and highly accurate readings to within 1 degree. An infinity prism delivers in-focus compass readings. Features photo luminescent card to provide battery-free illumination. Protective rubber collar with neck/wrist lanyard ensures safe use in challenging environment. Also works at high altitudes.