I have an SQM-L and when I take readings at a site with clear horizons I take readings at zenith, north, south, east, west, and average them. For each direction I take three readings. When I take the readings they are regularly all over the place. For example, my first reading might be 21.65 followed by 21.72 and then 21.63. I don't like using three readings that are so far apart so I end up taking readings until I get three that are at least within .03 or .04 of each other. This can be very time consuming because sometimes I might need to take ten or more readings before I get three that are within .03 of each other. Is this normal? I'm surprised the different readings can be that far off from each other.
My second question is how dark can the meter read? While at the Nebraska Star Party I took readings while it was cloudy and got 23.57. But in a completely dark environment it won't read. Just curious.