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An accelerometer is a device that measures proper acceleration; proper acceleration is not the same as coordinate acceleration (rate of change of velocity).
!#$ Mass Spectrometers Mass Spectrometers: A ShortExplanation for the Absolute Novice What does a mass spectrometer do? A mass spectrometer produces charged particles (ions) from the chemical substances that are to be analyzed. The mass spectrometer then uses electric and magnetic fields to measure the mass (weight) of the charged particles.