Which of the following is best gauge/machine to inspect the parallel screw ring gauges?

Which of the following is best gauge/machine to inspect the parallel screw ring gauges? Correct Answer Comparators

Screw ring gauges inspection by plug check gauges verifies that the ring gauges lie between their size limits. The major diameters are measured by inspection of the thread form which provides an indirect verification.

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The engagement diamond ring of 'N' was stolen by 'T', a thief who sold it to 'J' a jeweller. 'N' filed a suit for recovery of ring against 'J'. 'J' contended that he is ready to pay the price of the ring. Whether the decree for recovery of diamond ring can be refused on the ground that