Xi’an Yun Yi Instrument Co., Ltd mainly specilized in pressure instrument( precision pressure gauge, stainless steel pressure gauge, oil filled pressure gauge, pressure transmitter), pressure calibration instruments (Piston dead weight tester, pressure calibrator etc).Yunyi products are mainly used in industries of petroleum, chemical and textile fibres; in equipment used to process chemical, rubber, plastic and food; in machines such as hydraulic presses, air conditioners, and refrigerators; in devices used to provide medical treatment and in many other applications.