Electrical tester This 7 Pin Tester is designed to indicate a failure in the wiring on your trailer, caravan or horse trailer with a six light LED system. Quick, easy and very simple to use. Just plug the tester in the 7 pin socket or the 7 pin plug of the trailer / caravan and press the yellow button on the side of the tester. If the wiring is good, all the LEDs light up. Makes the checking of the wiring of your car, trailer, caravan and horse trailer easy.
Note 9v battery not included