An inkjet head includes an actuator unit, and a flow path unit. A NMR logging tool is disposed in a wellbore penetrating the formation containing the mud filtrate and the formation water and NMR measurements at different radial depths of investigation into the formation are made. Fluid flows through a tube of the device from the bottle into the reservoir. A first capacitor is coupled to a non-inverting input terminal of the first amplifying stage. The recess is arranged such that it does not overlap with any of the first fluid-conveying features or any of the second fluid-conveying features when the rotor is in any of the discrete positions.