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screen name     :0.0
pixel width     1024
pixel height    768
...
mm width        271
mm height       203

$ ack -ri HeightMMOfScreen tk8.6.11 -B1
tk8.6.11\generic\tkCmds.c
...
tk8.6.11\xlib\X11\Xlib.h
115-#define WidthMMOfScreen(s)  ((s)->mwidth)
116:#define HeightMMOfScreen(s) ((s)->mheight)

#!/usr/bin/perl --
use strict;
...
ppi             96 x 96
mm width        280
mm height       210