1. Robust 55Degree Inclinometer, Swinging Inclinometer. This nautical instrument is built to withstand the rigors of the marine environment. With a 55degree swing pendulum, it provides accurate tilt measurements for boats and ensures safe navigation. 2. Boat Inclinometer with 55Degree Swing Pendulum, precise tilt measurement on your vessel with this professional marine inclinometer. Its swingtype design and 55degree pendulum deliver accurate readings for navigation purposes. 3. Marine Inclinometer with 55Degree Pendulum Swing. These inclinometers are designed for use at sea, offering precise tilt measurement capabilities. Its swinging and 55degree pendulumaccurate readings make it an indispensable navigation tool for boaters. 4. 55Degree Inclinometer for Ships, Tilt Meter. This accurate tilt measurement device is specifically designed for marine applications. It provides precise tilt measurements with a 55degree swing pendulum.