Product description
Consist of a piece of B-D drawing .After all air is withdrawn out from sterilizer,the temperature reaches 132℃~134℃ lasting for 3~4mins,the B-D drawing transformed from light yellow to black.In opposite,the drawing keep the original color(light yellow) or uneven,it means maybe air exist inside the package or temperature didn’t reach to 132℃~134℃.
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