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Thanks Gary
Yes, I have read that pointing it at the Milky Way at the Zenith will give a brighter reading. I also read that you should try and not capture a bright star in your measurement. These all make sense but I'll have to experiment.
I'm also interested in comments I have read, that a brighter reading than expected may be high wispy cloud that is not immediately obvious, or maybe a high vapour content in the air.
My reading suggests that the SQM-L was developed because the SQM does capture a greater angular part of the sky and horizon light domes or nearby objects (buildings) higher than 30 deg, upset the supposedly zenith reading. I am fascinated that both of these are such a common problem for their main sales market!
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