An integrated device is for sampling and testing an analyte. A solution is provided to transcode a signal from a first signal type to a second signal type to ensure proper interfacing between devices that may operate using different signal types. A valve member is inserted within the aperture and adjusted to regulate the flow rate of water through the scaling member. An outer circumference of the inner-circumferential-side shaft and an inner circumference of the outer-circumferential-side shaft are spline-fitted to each other at a spline-fitted portion. This causes the unprotected sidewall spacers have a different size than protected sidewall spacers.