Differences between ASTM E331 & ASTM E1105

Question: “I have read both ASTM E 331 and ASTM E 1105 and can’t find any difference between the two test methods. It stands to reason that there is a difference, otherwise why two test methods? Can you please explain the difference between them?” Answer: There are fundamental differences that are revealed in the titles of each standard. These are identified with italics below: [...]