A relay device for providing communication between a sensing device and a computer system includes first and second communications modules and a processor. The mold includes a fine structural region having a fine irregular structure and a flat region in the periphery of the fine structural region. The follower comprises two follower legs and a spring retainer, and travels up and down the housing. The handle head may be configured to engage the catch. Alternatively, an easily compressible body such as a small closed metal bellows enclosing a gas, is positioned inside the fluid to absorb volume changes by compression. A test fixture is connected to unencapsulated pads on the integrated circuit to monitor an operating parameter for the circuit and to determine a unique identifier for the die.