1. There is no buffer in the box. I can't believe the tester came in a box with no buffer. How can I be sure that the sensor or tester board is ok? Let the product rattle in the box. "If you don't need a buffer, then why put a sponge in the black medium like in the picture? 2. The screw does not fit into the case. The screws on the lid don't fit well, so it rarely closes right away. The cover is plastic, so the screws will be damaged gradually.
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