tip in the form of a square of an edge or side length amounting to 0 5 mm the voltage pulses are supplied to the thus shaped tips 6 the voltage course is square wave and the pulse duration is essentially equal to the time span between two pulses or stated in another way the pulse duration equals one half of the pulse period duration this means that the expression 34 square wave shaped course 34 is to be understood in the narrower sense of the word however the relationship between the pulse duration and the time spacing of two pulses can advantageously amount to 60 40 with the exception of the flattened tips 6 of the pyramids the roller possesses an electrically non conductive surface the same holds true for the handle 1 due to this measure and the previously described measures there can be realized a controlled electrotherapeutic treatment with very few contact points in an exact predetermined arrangement of course it should be evident that there is necessary a second electrode which can be connected with the voltage source a further connection can be provided for a single electrode for instance in the form of a push button or pressure pin also for such there are applicable the previously specified requirements concerning the amplitude and the frequency of the direct current voltage pulses to insure maintenance of these parameters it is recommended to equip the apparatus with a luminescent control which if desired by means of pulsating light indicates that the previously mentioned operating conditions are being maintained and also indicates by means of an appropriate circuit dropping of the amplitude to less than 6 volts while there are shown and described present preferred embodiments of the invention it is to be distinctly understood.