An apparatus for wrapping products with plastic film includes: a ring-shaped element supporting a carriage; a drive mechanism for moving the ring-shaped element relative to the group of products; and, a motor for driving the carriage. The preferred wall protector includes a front surface and a rear surface constructed of a non-abrasive flexible material sealed together along edges. In a microscope, which is suitable for an automated lamp adjustment, for example, after an exchange of the lamp according to the method of the invention, motorized drives are provided for adjusting the lamp. As the recipient reviews the uploaded rich content, the amount of the rich content played by the recipient can be tracked, and the provider may be notified of whether or not the recipient has accessed the shared information andor the extent to which the shared information was reviewed. Therefore, the position of the tool center point with respect to the tool attachment surface is measured with high accuracy in a short period of time without using a substitution jig.