A fluid sampling device is provided comprising an elongated housing having a longitudinal axis, a plurality of alternating sorbent units and spacer units disposed longitudinally through the housing and slidably movable therethrough along the longitudinal direction, and means for individually and sequentially exposing the sorbent units to a fluid. 5 percent titanium, from about 4 to about 6 percent tantalum, from about 12. The guide heat pipe is placed in the circular recess. The technique includes determining an attribute of the layer based at least in part on the determined slope change. voltage, comprising a rectifier circuit connected to a pair of a.