Hey Jensen, Thanks for your comment and cheers for watching my video! These scales are definitely designed to be used indoors, you might be able to get a reading with them outdoors but you may have to squint if in direct sunlight, If it is of any relevance I believe that this is the case with the black scales as well because I would imagine it has more to do with the strength of the LED's then anything else. Hope this helps! Have a good one.
