… level, pressure or other variables of liquids or gases (for example, flow meters, level gauges, manometers, heat …
Explanatory notes
… level, pressure or other variables of liquids or gases (for example, flowmeters, level gauges, manometers, heat meters), … (b) Apparatus which merely indicate the total amount of liquid delivered over a period, which are … the water and the steam. (4) Electrical‑type , based, for example, on the variations of resistance, capacitance, …