A testing device for performing a white balance test on a display device of an electronic equipment is disclosed. The material is fabricated as a planar body having fold lines on which the body may be folded to encircle a product being packaged. In addition, even though sulfur is changed into a liquid state during charge and discharge processes, an electrode structure is not destroyed to realize a stable lifetime characteristic. The invention enables pervasive devices to be managed through a workstation to which they connect to synchronize without requiring any intervention by the pervasive device user. The holding portion is made of heat-resistant resin while the outer wall is made of non-heat-resistant resin. The single-pendulum milling head is driven directly by a second external rotor torque motor.