Microspectrometers are used in many different fields.
 
Spectral Unit Conversions

Nanometers
Nanometers = 10^7 / Wavenumbers
Nanometers = 1000 * Microns

Microns (Micrometers)
Microns = 10^4 / Wavenumbers
Microns = Nanometers / 1000

Wavenumber (cm-1)
Wavenumbers = 10^4 / Microns
Wavenumbers = 10^7 / Nanometers