The Hickok Waekon ABS+ Sensor & Signal Tester is designed to test the ABS wheel speed sensor's voltage output signal independently right in the service bay, including the "standstill" or "alive" signal from an Active Directional Sensor. This tool helps users determine if it's the sensor or another component of the ABS system causing the problem. This product helps techs save time and improve safety by testing ABS sensors in the service bay, instead of trying to read wheel sensor data on a scan tool while driving.