With our user-friendly technology, you can easily check the 15-pin trailer socket by simply plugging in the device and cycling through the functions. All LEDs must light up to confirm the function of each contact in the 15-pin socket. The best part? Our device stores the results until it is removed. In a second test, you can check the function of the trailer lines through the 15-pin socket. And that's not all – our testing device also offers an innovative turn signal failure simulation. Just press the brake and activate the turn signal to ensure that any faults in the vehicle are immediately displayed. With this feature, you can quickly identify and address potential issues.