The lines may be used to measure leading (spacing between lines of text), as well as the thickness of lines in the Nutrition Facts table:

• The 0.25 point hairline rule is required in the
  US Nutrition Facts table (NFT).
• The 0.5 point thin rule is required for the
  Canadian standard NFT.
• The 1 point rule is required above Calories in the Canadian standard NFT.
• The 2 point rule is required in the Canadian standard NFT, below the serving size declaration and above the vitamin declaration.
• The 3 point rule may be used to measure the spacing required between the outer box outline of the Canadian NFT and the text enclosed.

Type height for different point sizes of Helvetica® font (for uppercase and lowercase letters).

Clear see through polymer allows to measure, between lines, type heights on printed material.
Measures shown in both millimetres and fractions of an inch.

By overlapping this Nutrition Facts table over the one on the printed label, one can easily verify whether all the typographical requirements are met.

Conversion of Helvetica® font sizes in points versus mm and inches, for uppercase letters (left-hand column) and lowercase letters (right-hand column).

Table of Canadian and USA minimum type requirements for the net quantity declarations, based on the packaging dimensions.