Platinum 2" Water Pressure Gauge - 30 PSIFaria Beede&';s Platinum Series Instruments feature spun aluminum gauge dials with custom graphics and a polished stainless steel bezel providing a rugged, elegant look. All Platinum Series gauges feature Faria&';s revolutionary domed glass Fog-Resistant lens. These lenses shed condensation and resists scratching and other types of fouling common in the marine environment. A pressure gauge operates by sending a low amperage current through the gauges&';s meter to ground via a sending unit with variable resistance. The resistance of the sending units increase or decrease with the changes in pressure, temperature, etc...As the sender&';s resistance varies, the amount of current allowed to flow through it to ground changes and the meter deflects, showing the change in pressure.2"- Hole Size: 2.0625" (53mm)Specifications: Domed Glass Anti-fog, Scratch Resistant Lens Stainless Steel Bezel Blue LED Illuminating around the Perimeter of the Dial Illuminated Backlit Fire-Orange Tip Pointer Factory P/N OP1177*Sold as an Individual*Gauge Cover not IncludedThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Specifications: Series: Platinum Gauge Type: Water Pressure Gauge Size: 2" Box Set: No Voltage - Input Range (Volts): 12/24 V Box Dimensions: 5"H x 6"W x 6"L WT: 0.58 lbs UPC: 759266220232 Brochure (pdf)