Desiccator are sealable enclosure containing desiccants for preserving moisture

A desiccator is commonly used to extract water from various articles of clothing. Also, if you manage to get your phone wet, you can use a desiccator to remove it.

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it must be cooled in the desiccator in order to take the correct measurement on the scale while performing the experiment.

I think you should resubmit this question as How long can you leave a sample in a desiccator? and it would help if you gave information about what sample you are putting in.