14mm
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What do you want to measure about the marble? Its diameter, radius, circumference, volume, mass, density...?
The circumference of a regular-size marble, which typically has a diameter of about 1.5 centimeters (or 0.6 inches), can be calculated using the formula (C = \pi d), where (d) is the diameter. This results in a circumference of approximately 4.71 centimeters (or about 1.85 inches).
I would use a micrometer. A caliper would do as well.
A diameter of 3.5 cm is equivalent to approximately 1.38 inches. This size is similar to the diameter of a standard bottle cap or a small coin, making it relatively compact. To visualize it, it would be about the width of a large marble.
little round things usually made of glass about 7/16 inch in diameter used in games