Descriptions: Pressure gauges are instruments used to measure the pressure of a gas or liquid inside a vessel and, often, to help ensure the optimal amount of pressure for a given application. Pressure gauges can range from everyday instruments, such as those used to measure the air pressure in a car or bicycle tire, to highly accurate gauges used in mechanical and industrial processing. Most often, pressure gauges measure pressure relative to another reference. For instance, gauge pressure measures pressure relative to ambient air. An example of a pressure gauge measuring relative to ambient air is a tire pressure gauge or a blood pressure gauge. Differential pressure is the difference in pressure between two points, such as when measuring liquid flow along various points in a pipeline. An absolute pressure gauge measures pressure relative to a perfect vacuum, such as an atmospheric or barometric pressure gauge. All types of pressure gauges include either a male or a female mount to connect to the vessel where pressure is being measured, and display results on a dial with varying increments of measure across a given range. Features: Suitable for Air, Water, Oil & Gas Brass wetted parts for measuring non-corrosive liquid and gas pressure Circular dial is enclosed in a steel case for corrosion resistance Measures pressure with dual scale (psi/kPa) Display accuracy is + or -3/2/3% over the entire range of the gauge (ASME B40.100 Grade B) Lower mount or center back male connection with either 1/8" or 1/4" NPT rate Specifications: Connector Material: Brass Shell Color: Black Pressure Range: 0-220PSI Accuracy: 3/2/3% Dial Diameter: 42mm/1.65" Connection Size: 1/4" NPT Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Contents: 1 x Pressure Gauge (1A50926,1A50927,1A50928)