and the total number of strokes corresponds to the position of the sum wheel 4 b and thus to the position of the central hand 203 the hole counter has been moved further by one position on letting go the hole counter rocker 19 this is moved back through a spring region against a spring end 106 back into the initial position for zeroing the entire device a press button arm 103 of a first zeroing lever 18 is actuated via a third press button 211 this lever rotates about a pivot 107 a lug 128 on the first zeroing lever 18 thereupon via a pin 132 lifts the locking pawl 9 from the sum wheel 4 b and subsequently an edge 134 of the first zeroing lever 18 sets the heart shaped eccentric 2 back into the zero position with this the sum wheel 4 b and the central hand 203 also get back into the zero position the other counters are zeroed simultaneously with the above described zeroing of the sum hand 203 after the first zeroing lever 18 has travelled a part of its path a pin 109 of the first zeroing lever 18 catches a second zeroing lever 17 both zeroing levers 17 18 rotate about the same pivot 107 the second.