In this example of a flow meter filler the product is supplied to each filling nozzle through a flow meter. The control system translates measured flow rate to flow volume. Product can be supplied by gravity, by a pump or from a pressurised tank. Two types of flow meter are commonly used: (a) an inductive (magnetic) type that measures flow velocity suitable for liquids with moderate or high electrical conductivity, (b) a mass flow (coriolis) type suitable for all liquids.