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Hi guys.
The highest ever reading by my SQM-LE was 22.02 in December 2009. (It's been in storage since then). This was on a moonless night at my very dark permanent observatory site, where there is essentially no light pollution.
The SQM-LE is powered from a permanent supply: it has no battery.
However, anything much above 22 would be fairly suspect, and, as has already been mentioned in this thread, even the manufacturer states that readings significantly above 22 are likely to be inaccurate.
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