Pressure gauge (English name: pressuregauge) refers to the elastic element as the sensitive element, measuring and indicating higher than the ambient pressure instrument. The application of pressure gauge is extremely common, it is almost all industrial processes and scientific research fields. In the heat pipe network, oil and gas transmission, water and gas supply systems, vehicle maintenance stores and other areas can be found everywhere. Especially in industrial process control and technical measurement, mechanical pressure gauges are more and more widely used due to the high mechanical strength of their elastically sensitive components and the ease of production.