A micro-electromechanical actuator assembly includes a substrate that defines a fluid reservoir. The device may be a cylindrically shaped antimicrobial hydrogel having a central opening and a slit along its length so that it can be applied directly over a previously inserted urinary catheter. A housing seals the valve rod and valve blade from the ambient, and an actuator rod in the ambient, having at least one complementary magnet mounted thereupon, aligns with the magnet on the valve rod to form a magnetic coupling through the housing. After the relative location of the devices is known, the devices may be used to determine a distance of a surface within the environment. The pressing member side shim has hooks that extend over a surface of a respective pad side hook. After the provisional photographing process, the through image is synthesized with the recorded composition indicating image in a semi transparent manner, to display a synthesized image in place of the through image on the display.