FITS and the Unihedron connected Sky Quality Meters

Some programs gather information from the Unihedron Sky Quality meter products and insert that data into the Flexible Image Transport System (FITS) header.
Here are some programs that incorporate the SQM readings into headers:

MaxPilote (Freeware) incorporates SQM readings from an SQM-LE and SQM-LU series meters into the FITS header while at the same time provide constant readings in a live and updated Data Window.

CCDAutoPilot : details

FITS4Win2 :
FITS4Win2 reads FITS files and converts a set of known keywords (plus the MPSAS keyword) to Windows Image properties for searching, sorting, selecting, etc..

Basically, if MPSAS exists in the file, FITS4Win2 will present a "Sky Quality" image property value to the windows property system, enabling windows to use it as any other property value.

So for example, a folder full of images may be sorted by MPSAS value, or only images with MPSAS values greater than x selected, etc..