Article 18 requires graduations to be made of

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Multiple Choice

Article 18 requires graduations to be made of

Graduations should stay legible, durable, and resistant to chemical wear over time. Glass provides a hard, chemically inert surface on which graduation lines can be permanently etched or filled with contrasting material, giving sharp, lasting marks that won’t rub off or fade with use or exposure to solvents. This permanence helps ensure readings remain accurate and consistent across many uses and conditions. Metal markings can corrode or wear away, plastics or Plexiglas graduations can scratch, fade, or be affected by solvents, and may not hold up as well under repeated handling or temperature changes. So using glass for graduations best preserves readability and long-term reliability.

Graduations should stay legible, durable, and resistant to chemical wear over time. Glass provides a hard, chemically inert surface on which graduation lines can be permanently etched or filled with contrasting material, giving sharp, lasting marks that won’t rub off or fade with use or exposure to solvents. This permanence helps ensure readings remain accurate and consistent across many uses and conditions. Metal markings can corrode or wear away, plastics or Plexiglas graduations can scratch, fade, or be affected by solvents, and may not hold up as well under repeated handling or temperature changes. So using glass for graduations best preserves readability and long-term reliability.

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