An apparatus for measuring at least two of the following characteristics of a fluid; pH, partial pressure of dissolved gas or gases therein, inorganic ion concentration, hemoglobin, temperature, and the like, the apparatus comprising a vessel having a flow channel for fluid passing therethrough and means for inducing turbulence in the channel at specified locations; sensors for the above enumerated fluid characteristics located in the vessel along the channel and within the area of induced turbulent flow; and integral heat-exchanging means e.g., cartridge heaters, within the vessel and external solid state circuitry for maintaining or achieving a preselected temperature in a fluid passing through the vessel and in the sensors. Also disclosed is such an apparatus adapted to the analysis of very small quantities of fluids, e.g., blood, including components for sample storage and transfer, preheating, propulsion and electronic read out and display.
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