There is provided a simple, inexpensive reaction analysis kit and system capable of performing highly sensitive, quantitative measurement. The polyarylene sulfide may exhibit and maintain excellent properties, particularly it does not generate foam in the product or stain on the surface, has excellent mechanical properties such as tensile strength, and the like, and thus, it may be usefully applied in the industrial field of preparing polyarylene sulfide and manufacturing a molded product using the same. The housing defines an interior which received the optical fiber and provides space for accumulating excess length of optical fiber generated by differential thermal contraction of the jackets and the optical fiber. For example, the flow control turbine is operable generate a greater pressure drop in water produced therethrough as compared to oil produced therethrough due to differences in the density, viscosity or other property of the produced fluid. The stowage platform connects with the controlling body via a rotatable shaft and comprises a transparent plate disposed at the end of the rotatable shaft.