The instrument is equipped with lowleakage, reliable operation of the special pneumatic valve group and highsensitivity, high pressure leakage detection sensor (pressure sensor or flowsensor). The instrument has very high direct pressure resolution and detectionsensitivity, and has a powerful extended output, multi-channel parametersetting and selection, large-capacity record storage, communication processing,quality inspection, data transmission and other functions. The instrument iseasy and convenient to operate, and can realize manual or automatic testing ofthe products under different conditions.