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It can show your time,and can be as symbol of status.
You are probably referring to a watch glass. A watch glass is a small round glass plate that chemicals are put on to crystallize. It allows for easy viewing of the crystals.
it is used to collect evaporated air/gas in the liquid you have just heated
Yes. I replaced mine 5 years ago and I believe the cost was near $50.
It is used for grinding and mixing chemicals in lab.
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