An internal caliper gauge.
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The diameter is the measurement of a line that goes right through a circle, through the centre point. In cases where we have a ring or some other such object with multiple circles, we would have an external diameter and an internal diameter. The internal diameter is the diameter of the inner circle. The external diameter is the diameter of the outer circle.
The diameter does not affect the length. It is a separate dimension. Diameter is the cross sectional measure of a circular object.
Yes, a calibrated ocular micrometer can be used to measure the diameter or length of a field or object. Essentially, that is all that it is used for.
apparent diameter
The diameter by definition because a diameter of a given object is twice its radius.