Controls/Switches. Before moving any control switches, dials, or knobs , check their positions. If any appear inordinate (e.g., volume-infused counter or audible alarm level at the end of its range), consider the possibility of inappropriate clinical use or of incipient device failure. Record the settings of those controls (e.g., occlusion pressure limits ) that should be returned to their original positions following the inspection. Examine all controls amd switches for physical condition, secure mounting, and correct motion. Where a control should operate against fixed-limit stops, check for proper alignment, as well as positive stopping. Check membrane switches for membrane damage (e.g., from fingernails, pens). During the course of the inspection, be sure to check that each control and switch performs its proper function.