… Surveying (including photogrammetrical surveying), hydrographic, oceanographic, …
Explanatory notes
… 90.15 ‑ Surveying (including photogrammetrical surveying), hydrographic, oceanographic, … a piece of land; in determining heights above or below some horizontal reference level; and for all similar measurements … (e.g., liquid level indicators, flow meters, etc.) are, however, excluded ( heading 90.26 ). (V) METEOROLOGICAL …