how to work a christmas light tester

"I can definitely help you with that. A Christmas light tester is a tool used to test whether a string of Christmas lights is working properly or not. To use a Christmas light tester, simply plug it into an electrical outlet and then connect the light string to the tester. The tester will light up to indicate whether the string of lights is working or not. It's a great way to ensure that your lights are safe and functional before putting them up."