Magnetic flowmeters can also be used with liquids that are poor conductors, provided that they contain an adequate amount of charged particles...

Magnetic flowmeters can also be used with liquids that are poor conductors, provided that they contain an adequate amount of charged particles (seeding is sometimes required in these cases). The primary disadvantage of electromagnetic flowmeters is their high cost and power consumption. Also, they must be carefully calibrated and are limited to conductive fluids, as discussed above. Can you think of other ways in which volume flow rate can be measured?