Abstract: The present invention provides for a down-well fluid measuring arrangement, and related methods, having at least one surface defining part of a fluid path, the at least one surface having first and second ports each arranged to deliver fluid to a single pressure gauge (28), one of the ports being provided in the region of an obstruction formation (30) provided in the fluid path, the arrangement further including switch means (34) arranged to change the port delivering fluid to the gauge so as to allow for determination of a pressure difference of the fluid at the said ports and a third port located either upstream or downstream of the first port delivering fluid the gauge to allow of determination of a pressure difference and hence volume fraction.