This device is designed for accounting and control of oil products during gravity drainage from tanks. The S-FLOW gravity drain meter is standard equipment in the companies: TOTAL, SHELL, REPSOL - all over the world. It allows: • Measure the amount of fuel drained at the filling station p of each compartment of the fuel truck • Control the receipt of petroleum products by tanker and rail • Keep records of shipments of petroleum products to agricultural consumers Advantages: • Accuracy • Low pressure drop • No delay when draining fuel • Mobility (small volume and weight) • Absence of “dead residue” • Multi-performance • Ready to use • Connection to an ANDROID device with the ability to upload transaction history to Excel.