Microspectrometers are used in many different fields.

Spectral Unit Conversions

Nanometers
Nanometers = 107 / Wavenumbers
Nanometers = 1000 * Microns

Microns (Micrometers)
Microns = 104 / Wavenumbers
Microns = Nanometers / 1000

Wavenumber (cm-1)
Wavenumbers = 104 / Microns
Wavenumbers = 107 / Nanometers