20K precision balance shall comply with section 5 of AASTHO M231. a. General-purpose weighing devices shall conform to the accuracy, readability, and sensitivity indicated in Table 2. Within any interval equal to 10 percent of the capacity of the balance, the difference in the load indications shall be accurate to within 0.1 percent of the difference in masses. b. the balance shall have a capacity of not less than 20kg. c. The balance shall be a class G5 or better as per Table 2 of AASHTO M 231. d. The minimum readability and sensitivity shall be 1g or better as per Table 2 of AASHTO M 231. e. The minimum accuracy shall be 0.2 g (or 0.1 percent) or better as per Table 2 of AASHTO M 231. f. The balance shall have a linear response along the range of the scale. g. The balance must be able to display masses in grams. h. Repeated determinations of the mass of a test load shall yield load indications that agree with each other within the sensitivity specification for the balance. i. Mechanisms for adding or subtracting built-in internal masses shall function smoothly. j. Displays shall clearly display the readings they were designed to show.
