Yes, I ask the question in a multi-forum, because there was neither a description of the instruments used in the test nor an attachment to the equipment pictures. Just sayings on paper. This is not a nominal study for people who do not know what devices and equipment you do not know if one or two devices do not know the methods and foundations of the application Why? The reason for this is that the study was only documented with descriptions. There are no photos, videos, or equipment description only. Speak on paper with help. We do not know whether it is right or wrong. I am two people. So this is data and this is evidence for pictures and videos and these are all tools that were used in the selection. See all people ask the same question, why not all theoretical work? I hope the pictures link.