100% Repairable4-1/2″ Ritchie CombiDial and built-in inclinometerInternal gimbal systems for maximum stability during adverse pitch and roll conditionsScientifically matched sapphire jewel and hardened steel pivot dial movementBuilt-in compensators to easily adjust for deviation45 degree lubber linesExclusive built-in dual 12 volt NiteVu lightingFiberglass reinforced bowlExclusive 5 year warranty