Spink Electromagnetic Flowmeter-Instrument designed for measuring and indicating flow and total volume of conductive liquids. As there are no moving parts in the flow profile the device can be used to measure extremely dirty liquids containing solids. The flowmeter is for use with conductive liquids only. Range of applications. The flowmeter has been designed for use in all process industries including chemical, water, and wastewater. Features. The inductive flowmeter R-401 is a highly accurate and stable device. The construction of the flowmeter uses components with long-term time and temperature stability.