The latch mechanism includes the shoe release lever pivotally attached to the support housing for pivotal movement about a lever axis parallel to the tilt axis between the latched position and the unlatched position. The background layer has edges that extend beyond the edges of the legend layer such that the background layer prevents contact of the legend layer by coating materials during surface treatments of the surrounding pavement surface. The reaction container subjected to the process of sample preparation is transported to the analysis mechanism at a given time and the sample is analyzed. A hole passing completely or partially through the electrode may further provide an anchor to the living tissue, thereby stabilizing the array with respect to the tissue being examined. Movement of the drive train develops a movement in a dial indicator that is a function of the angle between the body and the blade.