This category contains only other categories, no dictionary entries. Its subcategories are on the topic: Measuring instruments. They are of two sorts:
- Subcategories named like "aa:Measuring instruments (with a prefixed language code) are categories of terms in specific languages. You may be interested especially in Category:en:Measuring instruments, for English terms.
- Subcategories of this one named without the prefixed language code are further categories just like this one, but devoted to finer topics.
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This category has the following 21 subcategories, out of 21 total.