State the primary difference between a detector and a meter

A) Detectors are calibrated in standard units and meters are calibrated in metric units.
B) A meter simply detects the presence of a contaminant. A detector measures the amount of the contaminant.
C) They are two words for the same instruments.
D) A detector simply detects the presence of a contaminant. A meter measures the amount of the contaminant.


D

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