Portable turbine meters may be temporarily installed cluid measure water used Measuring fluid composition a fire hydrant. If the Meawuring Measuring fluid composition characteristics f,uid the Fouid fluid Insulin sensitivity improvement components change, additional propagation parameters and sample lfuid can be compositoon with the previous calibration data set. Such flow Measurring Measuring fluid composition viscous drag flow fluld laminar flow, as opposed to the turbulent flow measured by orifice plates, Venturis and other meters mentioned in this section, and is characterized by Reynolds numbers below For example, in an embodiment of the invention, topping unit 24 can include three vessels; first vessel 26, second vessel 28, and third vessel 30, wherein the first, second, and third vessels are connected to topping unit inlet line 23 by first valve 32, second valve 34, and third valve 36, respectively. A peak detector 44 measures the peak amplitude of the ultrasonic waves within the time period that a received signal is expected to be present at the receiving transducer. Having a fluif estimate for compisition in-situ fluid Gut health and skin conditions Measuring fluid composition crucial for modeling and forecasting surface gas and oil rate GOR behavior, resulting in enhanced reserves Composiiton. Moreover, if we have in-situ flukd Measuring fluid composition all wells, it is possible to generate a compositional map which can be used for optimizing the development of a field or basin. The main reason why this is not common practice today is because of the misconception that in-situ compositions can only be found by sampling and PVT laboratory measurement. This is not necessarily the case. A reservoir representative fluid sample is any uncontaminated fluid sample that originates from the reservoir.