When conducting system checks in aircraft, there are countless components to investigate and many more tools to use for the process. Many of these systems are pneumatic, meaning they rely on pressurized air to perform functions like pressurization, cooling, sensing, and more. When working with these systems, it is important to monitor the air to ensure it is operating at an ideal pressure range. This demand can be met with air-ring gauges. Air-ring gauges, also referred to simply as ring gauges, are parts used to measure the air pressure within a cylindrical object by fitting around the exterior circumference of the cylinder, or workpiece. They are made of thermally stable metals like steel, and they function to measure the diameter of the object around which they fit. Air-ring gauges provide the ability to measure air pressure through this function, and we will further discuss the types available, as well as their applications, in the blog below.