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Comparing a permanently installed meter with a portable instrument for an audit, the portable instrument

  • A.gives a continuous record without further equipment
  • B.requires the process to be shut down to fit it
  • C.can be moved to wherever the question happens to be
  • D.is always the more accurate of the two

Answer: C

One good clamp-on meter serves fifty measuring points over a week, which no permanent installation could justify. A permanent meter gives the continuous record and is generally the more accurate, being properly installed.

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