RitchieSport Compass. RitchieSport Compass Features, 2″ (5.08cm) Direct Reading Dial, Easily Installed, Fits Standard 2-1/16″ Instrument Hole, View Adusts up to 30 degrees, Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement, Exclusive Built-in Green NiteVu Lighting, High Temperature Composite Construction for Extended Operating Range, DirectiveForce Magnets, , Approx. Shipping Weight: 5oz (142g), Notes: X-21 Compasses do not have Built-in Compensators., Comes standard with 12V lighting. Some custom built OEM models may have different lighting. Contact Ritchie for replacement lighting. .