A turret-type spray nozzle assembly having a rotatable turret which carries a plurality of spray nozzles and which is rotatable on the nozzle body for locating a selected one of the turret nozzles in an operative spray position. The device restrictively engages each of a subject’s hands so that neither is free to insert a false specimen into a container. The deposition of the coating can cover less than the total circumference of the wire. The apparatus also includes at least one magnetic component which creates a static magnetic field that is arranged to deflect charged particles away from the opening and the surface of the object. In this state, a second position of the bonding tool is detected. The positive side and negative side switch circuits may be provided in a buck boost configuration or two half bridge configurations.