Explanatory notes
… incorporates an element sensitive to variations in the quantity to be measured (e.g., Bourdon tube, diaphragm, … the principle of the fluid meters of heading 90.28 (turbine‑type, piston‑type, etc.), but the majority are based on the … meters in heading 90.28 . (B) Anemometers of the special types used for recording the rate of flow of air currents in …