may include a plurality of active individual needle shaped electrodes which during operation may be electrically connected to an associated high voltage source a controller may be included for controller the voltage source the at least one active electrode assembly and the controller may be arranged in a housing a signal device may be arranged at least one of in and on the housing the signal device may include an optical indicator for outputting a signal to a user the signal may correlate with at least one parameter of the material web the at least one parameter may include a polarity of the material web application_number US 201314397854 A description fig1 shows a production plant 1 in which a material web 2 is moved in a movement direction 3 the production plant 1 comprises an antistatic device 4 with the aid of which an electrostatic charge on the material web 2 is reduced and preferably eliminated or neutralized purely as an example five positive charge units 5 are indicated in fig1 upstream of the antistatic device 4 on the material web 2 with reference to a movement direction 3 which are existent on the material web 2 for production reasons in the area of the antistatic device 4 five negative charge units 6 are indicated which are generated with the aid of the antistatic device 4 and which cause neutralization of the five positive charge units and remove these in the ideal case illustrated the material web 2 with reference to its movement direction 3 is charge free or charge neutral downstream of the antistatic device 4 according to fig2 an antistatic device 4 comprises at least one active electrode assembly 7 wherein the shown electrode assembly 7.