| Operation Steps：
1. Prepare the glass lid and hammer. 2. Put Transparent Tape on the glass lid surface, in case of hurting people during testing 3. To knock on the 1/6 position of the lid edge (No near to the steam hole) till the whole lid broken. 4. Count the particle number within 50*50mm square. Particles no less than 80 pieces and each one no more than 2g are qualified.
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