Abstract: A system for simulating the parameters tested by a testing device is described. The testing device is used to verify that a sensor and tone wheel of an anti-skid system are properly functioning and connected. Accordingly, the testing device is used to check the resistance of the sensor, the level and frequency of the output voltage from the sensor, and whether the tone wheel has any missing teeth or is improperly aligned with respect to the sensor. The invention is directed to a system for simulating all these parameters to verify that the testing device is functioning properly.