The air tightness test needs an air tightness detector, which is a device specially used to detect the air tightness of cavity mechanical products. Mainly used in the production of automobile engines, gearboxes, axles, water tanks, oil tanks and so on. There is a sealing requirement for the cavity. The air tightness detector adopts the intelligent design of embedded control, which can automatically complete the test program and judge the test results.
If it is specific to practice, I suggest you consult professional musical instrument expert GLFORE.