how to use xmas light tester

To test your Christmas lights, simply plug them into the tester and turn it on. If there's a problem with one of the bulbs, the tester will indicate which one it is, and you can replace it. If the light is still not working after replacing the bulb, then there may be a problem with the wiring or connection. In that case, it's best to call an electrician to inspect the lights for you. Remember, safety first! Always turn off the power before working on the lights.