A Lease Automatic Custody Transfer unit or LACT unit measures the net volume and quality of liquid hydrocarbons. A LACT unit measures volumes in the range of 100 to 7,000 barrels of oil per day. This system provides for the automatic measurement, sampling, and transfer of oil from the lease location into a pipeline. A system of this type is applicable where larger volumes of oil are being produced and must have a pipeline available in which to connect.