Which brand is better, Upton airtightness leak tester or Hitachi?

Hillary good. Xiamen Xili instrument airtightness tester scalability, with the ability to independently innovate and develop automatic atmospheric pressure calibration zero system, temperature compensation system, etc., and has the test parameters saved, history can be exported, support barcode scanning, connecting printers, support for remote control, I / O external control and other functions, maximize to meet a variety of different test conditions. Shangteng airtightness leak tester price is higher, the performance is not as good as Xili.