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ok, would you please tell us if this is a position or type of work or you are talking about a specific place or building so we can help you more, I think when you will explain this then things will be more clear,
please put in your mind that the (certification, diploma.....) that you are talking about belongs to what?
according to your other questions I bilieve that you are talking about medical or something belong to that, so I suggest you use the word (مختبر)