Abstract: A fluid sensing device includes a venturi tube and a fluid resistive element. The venturi tube defines a first open end through which a flow of fluid enters, a second open end from which fluid flow exits and a constricted midportion therebetween. The fluid resistive element is located within the venturi tube. In combination with the tube, the fluid resistive element measures flow for accurate sensing of the flow over a range of fluid flow into the tube. A labeled fluid sensing device, includes a fluid flow sensing tube and a label. The label has a first panel secured to a surface of the tube and a second optically sensable panel removably connected to the first panel.