Which of the following is true for the measurement of taper ring gauges?

Which of the following is true for the measurement of taper ring gauges? Correct Answer Taper ring gauges of sizes below the diameter of 20 mm are best measured by inserting precision balls of different sizes in the gauge

Taper ring gauges of diameter below than 20 mm are best measured by inserting precision balls of different sizes in the gauge and the distance between the top of each ball and one of the end faces of the gauge is measured.
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