Device for monitoring of wearing parts

The invention relates to a device for monitoring of wearing parts 18, in particular of internal combustion engines. When monitoring the function of the wear part 18 and on the other hand, the use of prescribed wear parts 18 on the one hand checked. The apparatus comprises a maintenance switch 10, which via a voltage supply 12 and a data line 13 has, on. The data line 13 is connected to a display 14 on which the check result of the maintenance switch 10 can be displayed. In the wear part 18, a chip 22 is arranged, which is identified with a reading device 23rd The reader 23 is integrated in the maintenance switch 10 and connected to the power supply 12 of the maintenance switch 10th Thus, a simple and cost-effective monitoring of the functioning and the use of prescribed wear parts can be realized.