Except for these there types, there are also many other flowmeters like electromagnetic flowmeter, vortex flowmeter, turbine flowmeter, ultrasonic flow meter, orifice flowmeter, metal tube rotameter, etc. And various of device is used for measuring as well, for example there are pressure transmitters and differential pressure transmitters, ultrasonic level gauge and radar level gauge and flow totalizer. http://www.jyflowmeter.com/electromagnetic-flow-meter/