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It is the same as other people's impressions. Not only there is dirt right after opening, there is a high probability that the cover glasses are stuck together. Given the waste of peeling time, the cover glass that sticks in the end will be thrown away as it is, so even if there are 200 cards, the number actually used may be 100 pieces. Then how about the price is cheap, too? I think. Stress that is frustrating when I have a cover glass that sticks is also considerable.
The size of the cover glass is not in place and it is dirty even after cutting! The surface is chlorine of tap water ??? I think that the surface is also partially white and I think that it is not suitable for precise observation!
There is a difficulty in quality. Freshly opened, there is already dirt on the glass. I think that it is fine glass chips, dust or mold. Therefore, it can not be used for preparatory specimens. However, there is no particular problem as a cover glass for stool that consumes a large amount of disposable. I think that there was no cover glass that cost less than this one.