Grain size is up to 0.0625 mm (0.0025 in) with individual grains too small to be distinguished without a microscope.

The two species are not easily distinguished from one another without microscopic examination.

It is difficult to distinguish from related species without microscopic examination.

He picked a spot that he seemed able to distinguish without difficulty.

Simple assault can be distinguished without the intent of injury upon another person.

It is often difficult to distinguish between the two without further testing.

The guidelines distinguish between spouses with children and without children.

It is hard to distinguish them without careful inspection of their looks.

Ovshinsky is also distinguished in being self-taught, without formal college or graduate training.

This is the number of things we can distinguish between without counting.