How Do You Build A Continuity Tester?
Continuity testers are diagnostic tools to determine whether an unbroken conductive path occurs between two points. You can make one in many different ways, from simple to extravagant, but the basic idea remains the same: Your tester must produce a small current that will travel between the two points in question. A small bulb should light up if a conductive path exists—an indicator that continuity does indeed exist between the two points. Make your own continuity tester using a few household items. Place the AA batteries end to end, with the positive tip of one battery touching the negative flat side of the other. Wrap them in the duct tape to hold them together; ensure that they remain in contact with each other. Unbend the paper clip, then bend about a third of it around the silver part of the base of the lightbulb. Cut a 4-inch length of electrical tape and poke the straightened half of the paper clip through the tape near one end. Affix the lightbulb to the tip of the batteries
