Angle Protractor ±10 Degree Mini Electronic Digital Protractor Inclinometer Features: Made of material, durable, wear-resistant and long-time service . Perfect accessory for you when you out for sailing. Portable size:convenient to take, convenient to work with other measuring tools and enlarge measuring range. High-Resolution Clinometer for Modern Boats Mounts on Bulkhead. Purpose: Adjust the horizontal angle. Specifications: Material:ABS Package Includes: 1x Inclinometer note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.