Well, I took the meter to work with me,sun was in and out at home.If I held it outside for instance it read 4,in the truck(tinted slightly, on the dash) 2. Stood outside ,5, in a glass jar,5.Don't see any difference the glass made.Will try outside again tomorrow,for instance in an aquarium,I notice the tempered glass is sorta "greenish", if you look at it just right.Held near bald head "OFF SCALE" .talk to you guys later.scott.

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