Have you tried it at other locations? Here is a link for those who don't have a Sky Quality Meter. It is the magnitude charts for the NASA Globe Light Pollution observations using Orion.

http://www.globe.gov/GaN/observe_magnitude.html Erik http://www.globe.gov/GaN/observe_magnitude.html

For the ten or so scopes that set up at SPOC last night, I took a ZLM reading with my Sky Quality Meter around 9:30pm.   It was 20.15 mpsas which is about equal to a ZLM of 5.6.  Clear Skies - Kurt

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