HTY-FT221 Automatic Filter Integrity Tester is an intelligent analytical instrument developed independently by Zhejiang Tailin bioengineering Co.,Ltd, with the characteristics of mini size and highsensitivity. The tester has various standard functions, including forward flow test, bubble test, and water immersion test, besides, forward flow test and bubble point test are conducted together. It can automatically conduct self-test, control the setting time and the test time, save and print the current test results, and display historical data by graphic, which can reflect the changes of the detection time and the gas flow directly.Working principle: in the same gas pressure gradient, measure or observe the gas volume getting through from the other end of the wet filter to check the integrity of the membrane filter.