1. The ultramicrometer is a precision instrument used for measuring very small distances.
超微测微计是一种精密仪器，用于测量非常小的距离。
2. By using an ultramicrometer, the scientists were able to accurately measure the thickness of a single human hair.
通过使用超微测微计，科学家能够准确地测量一根人头发的厚度。