… Instruments and apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases (for example, flow meters, level gauges, manometers, heat meters), …
Explanatory notes
… ‑ Instruments and apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases (for example, flowmeters, level gauges, manometers, heat meters), … the quantity to be measured (e.g., Bourdon tube, diaphragm, bellows, semiconductors) moving a needle or a pointer. In …