Savona Equipment has New, Used, and Reconditioned Spectrometer Machines for Sale. A spectrometer is a scientific instrument used to separate and measure spectral components of a physical phenomenon. Spectrometer is a broad term often used to describe instruments that measure a continuous variable of a phenomenon where the spectral components are somehow mixed. In visible light a Spectrometer can separate white light and measure individual narrow bands of color, called a spectrum. A Mass Spectrometer measures the spectrum of the masses of the atoms or molecules present in a Gas, Liguid or Solid.