the apparatus for separating and measuring mixed fluids , specifically the separation of crude oil and water and the volumetric measurement of each of the mixed fluids using a mechanical portable device primarily involving a separation vessel , an adjustable float within the vessel which allows the fluid of less specific gravity to be released from the top of the separation vessel through an upper pipeline , the heavier specific gravity fluid to be released from the bottom of the separation vessel through a lower pipeline , with fluid volume meters on each of the pipelines to measure the liquid flowing through the respective pipelines , the apparatus presented as a portable unit transferable from one pumping device to another , allowing for an accurate measurement of the fluids being extracted by the pumping devices .