[Quality]: The marine clinometer adopts a double tube design to provide clear readings, ensuring that you can make accurate angle measurements. [Wide Application]: Sailing clinometer can be applied to sailboats, fishing boats, yachts, cargo ships, etc., and is very suitable for sailors, navigators, and enthusiasts. [Function]: Marine clinometer is suitable for navigation, docking, etc. to ensure the stability of the boat on the water. [Please Note]: The level gauge will also work uninterruptedly at night, and is equipped with a night lighting double tube for your convenience. [Material]: Professional boats inclinometer is made of PP material, which is strong and wear resistant to ensure long term performance and reliability. Specification: Colour: As Shown Material: Plastic Size Chart:15.3cmx9.5cmx0.75cm/6.02inchx3.74inchx0.30inch Package Contents: 1x Marine Clinometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.