If you do not have a millimeter ruler, you can print a very accurate, disposable paper ruler. Simply click here to open the PDF containing a disposable paper ruler, and please disable any "shrink to fit" options on your printer.
Timex Sunglasses
Timex T910 (Sun)
Timex T918 (Sun)
Timex T916 (Sun)
Timex T924 (Sun)
Timex T927 (Sun)
Timex T914 (Sun)
Timex T926 (Sun)
Timex T913 (Sun)
Timex T915 (Sun)
Timex T912 (Sun)