The invention provides a measuring method of a tread wear amount by using a pneumatic tire in which a mark portion is formed on a part of a tread surface, the mark portion changing its surface shape as wear progresses. The specific physico-chemical structure of the devices of the invention allows fluid containment and absorption of wound secretions whilst avoiding skin macerations. A separate retaining plate seals an edge of the cuff with the mount and traps an inflation tube extending from the cuff to the inflation line of the tube. These multiple lights are condensed upon said object 1 such that part of the region of the condensed light pattern of said multiple spatial modes is made to spatially overlap with the condensed light pattern of the other light. The terminal may obtain a position estimate for itself based on the second information. The pretreated object is arranged in a flux bath for fluxing of the object and arranged in a zinc bath in order to have the material of the object react with zinc and to apply a zinc-containing layer to the object.