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From what I can tell, units have very different scales.
My PW seems to have a decent screen (pretty uniform, no color splashes) - but the light is much weaker compared to some I have seen. Below 4, it is barely noticeable in a dark room.
There is no way to read below 10 in absence of other light.
I keep it at 14 in darkness. 20 in lighted environments.
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