Engineers have learned that if the temperature of coolant within a heat exchanger is raised above the coolant’s boiling point by the entering hot fluid, the boiling of the coolant can cause corrosion within the heat exchanger. The envelope encases a plurality of internal films that include a polymeric film having a plurality of reflective stripes disposed thereon and spaced apart on the films. The bottom portion advantageously provides a low peripheral profile, allowing access to peripheral ports disposed on the sides of the computer while the computer is disposed thereon. At least one via is used to conduct the first signal layer and the second signal layer. A uniquely designed plunger and barrel in the fuel injection pump incorporates an anti-knock helix shaped plunger that changes the idle injection timing for sound attenuation. The system can be used to measure ambient hydraulic pressure, fluid injection or fluid withdrawal tests for inferring formation properties and tracer tests for inferring properties of the formation controlling chemical migration.