Explanatory notes
… (c) Thermometers, pyrometers, barometers, hygrometers and psychrometers ( heading 90.25 ); (d) Instruments and … in the quantity to be measured (e.g., Bourdon tube, diaphragm, bellows, semiconductors) moving a needle or a … per unit of time) and are used for measurement of flow both through open channels (rivers, waterways, etc.) and through …