Section 62. Size of type

Whenever a requirement of law relating to size of
  type is stated in point size, the type size requirement shall be  deemed
  met  if  the  x-height of the type is a minimum of forty-five percent of
  the  specified  point  size.  Each  point  shall  be  measured  as  .351
  millimeter.  The  x-height  size  shall be measured as it appears on the
  page. The x-height is the height of the lower case letters, exclusive of
  ascenders or descenders.