ultramicrometer

ul·tra·mi·crom·e·ter

U0011300 (ŭl′trə-mī-krŏm′ĭ-tər)n. An extremely accurate micrometer.

ultramicrometer

(ˌʌltrəmaɪˈkrɒmɪtə) n1. (General Physics) a micrometer for measuring extremely small distances2. (Tools) a micrometer for measuring extremely small distances
Translations
ultramicrometro