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 distancesTranslationsultramicrometro