Features: The dial scale are clearly visible, easy to use. Used to measure the pressure of various fluid medias. Widely used in petroleum, chemical-fiber, metal-lurgy, and other industrial sectors. Made of high-quality stainless steel alloy, the brass interface are effective against corrosion and rust, and has a long service life. Pointer design, the change of the measured pressure uses the connecting rod to drive the pointer of the sectors transmission gear segment to rotate to indicate the corresponding pressure value. Package Includes: 1x Vacuum Gauge Specifications: Material: Metal Size: Approx. 9x6.8x6.8cm or 3.54x2.68x2.68in Installation Diameter: 1 or 4 Thread Specification: BSP note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.