The flow meter is one of the oldest types of positive displacement flow meters. This oscillating piston meter is mainly similar to a nutating disc meter. Except that its measurement device is one split ring/ piston that only oscillates within a single plane and this makes it more easy to maintain and durable than any other PD meter.
Fluidyne made petrol flowmeters are exactly what you need when it comes to accurate consumption or dispensing of petrol. Built on the time tested positive displacement principle, the Fluidyne petrol flowmeter combines accurate and repeatable flow sensing along with safety by usage of certified electronics flameproof enclosure.