... floor) 150cm front in various directions, side, bottom of the cap ring drop test, 50 times, readers are still ... damage the surface, especially in the front and bottom of the nicks or dents, but readers ... still work. Ring the reader at the bottom of cap loosening tension is too large, the reduction of ... : 220 volts then the contact with the bottom of the cap ring. Phenomenon: the sparks were flying, able ...