Unreliable SQM – Dark Sky Meter Review

I've tried (on an iPhone 4) the app at two sites. Both were urban/suburban transition. At one I got a reading of 19.8 while the sky had a NELM of 4.2; at the other, with a NELM of 4.5 (and a bright 1st quarter moon) it gave a a reading of 23.8(!). I don't expect much for 0.99$, but these readings are so far from reality that I must recommend against.
Review by lsfinn on Dark Sky Meter.