The doctor is an "ENT" (ear, nose, and throat doc) or an "Otolaryngologist".
His technician/grunt/slave who runs the hearing test is an Audiologist.
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The instrument which is used to measure snowfall is called a snow gauge.
Mass is measured against a standard by using an instrument called a balance.
an oscilloscope
the answer is a ruler because it is and instrument used to measure someone in govern
The instrument used to measure the diameter of spherical objects is called calipers.