This video is an example of an un-moderated usability test of a physical device. Un-moderated usability tests are excellent for determining how users interact with your product in the absence of guidance. The following participants are given the task of using a perforating machine.
By observing the participants’ actions, you can determine where the points of interest are. In this example, each participant carefully read instructions before operating the device and did so without issue. If there are issues, you can determine quickly through the video whether or not the confusion came from the instructions or the physical design itself.