Volumetric flow meters - MS Liter counter fiscal for hydrocarbons.
Flowmeter Liter Counter Totalizer with 4 Programmable Alarms and Reset Input + Flow Sensor for 1/2" inch Pipes (DN15): Amazon.com: Industrial & Scientific
Digital liter counters for Oil "HIGH FLOW" - Digital liter counters and dispensing guns for Oil - DIGITAL LITER COUNTERS AND DISPENSING GUNS - Products
Flowmeter Liter Counter Totalizer with 4 Programmable Alarms with Flow Sensor for 1-inch Pipes (DN25): Amazon.com: Tools & Home Improvement