The Seago MON842 is a light weight heavy duty monocular incorporating a hand bearing compass and range finder. The monocular is splashproof and nitrogen filled to avoid misting and water ingress. They come in a durable protective carry case. Magnification: 8xObjective lens dia: 42mmField angle: 7°Exit pupil: 5.3mmEye relief: 19mmPrism type: Porro BAK-4Field of view: 122m at 1000mRangefinder: ReticleLens coating: Multi coatingHousing: ABSWeight: 343gDimensions: 145x65mm ** COMPASS ZONE B: Areas between 40° North latitude and 60° North latitude