Guanying technology professional leak detector R & D and manufacturing, the product model for GY-LTDA-10T type gas leakage test instrument, special air tightness testing for fuel lines and design, double position detection, can realize simultaneous detection or automatic change detection, has good adaptability. Double pressure detection can be intelligent switching function, detection of scientific process. Detection of pressure from 0.01Mpa-0.7Mpa, according to the system needs to start the high or low pressure detection. Air tightness detection technology, rigorous testing to the fuel system, control of product quality, improve product grade.