2″ (51 mm) Direct Reading Dial. Easily Installed, it fits standard 2-1/16″ instrument hole. The view adjusts up to 30 degrees. Features: Exclusive built-in 12V green NiteVu lighting, scientifically matched sapphire jewel & hardened steel pivot dial movement, high temperature composite and DirectiveForce magnets. Exclusive 5-Year Ritchie Warranty. Note: X-23 Compasses do not have built-in compensators