Check the Air Pressure: The inflatable Boat Air Pressure Gauge adopts dual pressure units (psi with bar units) to meet different measurement habits, and it can be used with a high pressure hand pump (not included). Accurate Reading: The raft pressure gauge adopts a pure copper movement, which is accurate in measurement, and the fine scale allows you to easily read and easy to use. Small size, light weight, easy to use and portable, the size is about 7.8cmx1.9cm/3.07inchx0.75inch. Suitable for: Kayak measuring range 2 BAR or 30 PSI, suitable for inflatable kayaks, boats, surfboards, beds with and correct pressure. High Quality Material: Inflatable Boat is made of high quality PVC, beautiful and durable; double air tight gaskets, wider application range. Perfect Gift: The Gauge Measuring Tool is a great gift for anyone who loves outdoor rafting, surfing and other sports. Specification: material: PVC, rubber, copper Size Chart: 7.8cmx1.9cm/3.07inchx0.75inch Package Includes: 1Gauge Note: Please allow slightly errors due to manual measurement and different monitors.