These 6" test gauges fit easily in a carrying case and can also be permanently installed on instrument shop test benches or test panels. Two types are available: stem mount and panel mount. They come in a variety of pressure ranges from 15 to 5000 psi and vacuum to 30" Hg. These gauges feature a solid front cage, which provides a partition between the pressyre measuring element and the window, with a pressure-relieving back. Parallax errors are minimized by aligning the knife edge pointer to with the reflecting mirror band on the dial. And adjustable pointer allows front zero adjustment. Other calibration adjustments can be made from the back without removing that case.