1. The SIM card slot is shaken by air, and the result is obtained in 2S, with stable performance
2. If the pointer is difficult to rotate, it is airtight, and if the pointer rebounds, it is not airtight
3. During the test, align the bracket with a small hole on the lower left, clamp tightly to ensure accuracy and durability
4. The integrated meter head is more convenient to operate, and it is more worry-free to observe the pressure changes. Press the cylinder to know the airtightness
5. 9-12cm adjustable clamping, durable, simpler and more accurate, compact and portable
6. Size: about 16 x 4.2cm
7. Weight: about 164g