This GTR Controls Vacuum/Pressure Gauge Type 201, 25S-30-0-30M-1-0, 1/4" Male VCR is a top-quality product made in the United States. It has a reliable face diameter of 2.5 inches (63 mm), a connection diameter of 1/4 inch, and can be mounted on either the side or bottom. The gauge is suitable for use in air pressure gauges, hydraulics, pneumatics, pumps, and plumbing, making it a versatile tool for various industries. It has a maximum pressure of 30 psi (2.1 bar), ensuring that it can handle different pressure ranges with ease. This GTR Controls gauge is an excellent addition to any industry that needs a reliable and accurate pressure gauge. It can measure both vacuum and pressure, which makes it ideal for a wide range of applications. With a 1/4" Male VCR connection, it is easy to install, and the readings are easy to interpret, thanks to the clear face diameter.