In the electronic device industry, airtightness testing is a core component to ensure product reliability, safety, and longevity. It directly relates to whether the device can effectively resist external environmental damage. For example, protection level assurance is used to verify whether devices (such as smartphones, smartwatches, outdoor monitoring, automotive electronics, medical equipment) meet the nominal waterproof and dustproof levels (IP67/IP68), preventing moisture, dust, corrosive gases from entering and causing short circuits, corrosion, and performance failure.