in reply to Tk screen and monitor size in mm, DPI and scaling

I'm on X11, both Tk and X11 give me the same numbers. The number are definitely wrong. Also, when I switch to a different monitor, which has the same resolution but a different size, the numbers stay the same.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]