A carton for cut sheets of paper has a bottom wall, opposite side walls, and opposite end walls. The invention also relates to methods of measuring improvements in a person’s skin health by measuring elasticity before, during and after human clinical trials of topical andor oral treatment compositions. The method may include establishing, at a first wireless device, a clock to be shared with at least a second wireless device; and sending, by the first wireless device over a short-range wireless link, a command to at least the second wireless device, the command indicating an operation to be performed by at least the second wireless device at a time defined by the clock. The system includes elements for detecting a discontinuity in the sheet product. In another embodiment, the clamp holds a conductive structure in place between the PC board contact pad and the IC package contact pad, and current is carried primarily over the conductive structure, rather than over the clamp.