Application:Widely used for Trailer (can also be a caravan or bicycle carrier)
Using Method:Put the plug in the connection of the tester. Press the yellow button on the side of the tester.
Note:If a LED doesn't light up, it is because the corresponding wire is defective. If all the LEDs don't light up, then the mass wire is damaged or all bulbs are defective.
Car Camper:Put the tester in the socket of the car. Press the yellow button on the side of the tester. If the wiring is good, all the LEDs light up. Do again steps 4 as previous.
High Performance: Professionally manufactured, safe and reliable to use