I produced the calibration ring (five points), mainly used for pneumatic, electric meter, military, aerospace, automobile and motorcycle industry measuring chamber diameter table, inside micrometer or appropriate precision pneumatic plug and electronic plug gauge calibration, test conditions for 20 ℃ + - before 1 ℃ temperature test must wait at least 8 hours, the machinery manufacturing also Sunon ring in bore size delivery. Service 1, I solemnly promise: under normal use and service, equipment quality problems, both in the service of the three bags. 2, during the warranty period, the company services personnel to ensure product safety and reliable operation. Companies sales, service one-stop service staff keep in touch with customers to provide quality and efficient service and technical support. 3, where Zhao Ming Control Meter product comes with a lifetime maintenance services provided by the Company. I produced the pneumatic test series of products which have stable performance, reliable, simple structure, high accuracy, easy to operate and can realize the advantages of non-contact measurement, it has been widely used in a large number of machinery industry. Measuring pneumatic test series products can be used the following parameters: diameter, outside diameter, width, pitch, depth, thickness, roundness, taper, concentricity, straightness, flatness, parallelism, squareness, air permeability and sealing and so on. Used in automobile and motorcycle parts, construction machinery parts, wind power components, military and aerospace customers require precise measurements, measurements based on customer needs, providing various types of special pneumatic measuring device.