Usage Tips:[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 the stability of on the water.tool for ship , nauticasl enthusiasts, and marine maintenance personnel who demand inclination data for their. [Please Note]: The level gauge also work uninterruptedly at night, and is equipped with a night lighting double tube for your convenience. [Material]: Professional boats inclinometer is made of material, which is strong and wear to long term performance and reliability. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:White Material:Acrylic Package Contents: 1 x High Precisions Marine Inclinometer 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.