The AMETEK US Gauge 1X539 is a high-quality air pressure gauge with a 3-1/2 inch diameter face and a maximum pressure of 30 psi. This gauge is designed for side or bottom mounting and is manufactured in the United States by AMETEK. It features a 1/4 inch connection diameter and comes as a single unit. Ideal for use in various industrial and business applications, this pressure gauge provides accurate and reliable measurements for monitoring and controlling air pressure levels.