A pressure gauge works by delivering a low amperage current through the gauge's meter to the ground through a variable resistance transmitting device. It is the compressed air's relative pressure within a system. With variations in pressure, temperature, and so on, the resistance of the transmitting units increases or decreases. It is a calibrated pressure indicator that links to a water pipe or tank. This latest addition to the collection of nautical gauges is a classic type of gauge. This water pressure gauge exceeds all expectations since it depicts the most up-to-date fog-resistant characteristics. Perimeter lighting makes it simple to view gauges day or night. Key Features: Has a fog-resistant domed lens The item has a black dial and white and silver graphics Equipped with a perimeter-lighted black dial The black pointer orange tip Specifications: Brand: Faria SKU: F22023 Product Weight: 0.62 lbs. Product Width: 5" Product Depth: 4" Product Height: 5" Material: stainless steel bezel Lens type: domed fog-resistant Lens Condition: New Product alternative SKU: F12875, F12903, F13712, F13812, F14612