A chip with resistive, metallic strain gauges distributed on surfaces on and buried within the chip. There are upper and lower clamp members having jaw portions that define a receiving area for the hydraulic line. It may not be used to interpret or limit the scope or meaning of the claims. A peak-to-average signal is generated based on the time-domain averaged signal. The second opening provides access to the second chamber and is further configured to engage a specimen collecting device to leave a portion of the specimen collecting device within the second chamber. A back side layer of silicon dioxide or silicon nitride is then removed to restore the substrate to a substantially planar state.