The Magic Box commercial grade Christmas light tester isolates twisted bulbs, empty sockets, and bad fuses by forcing electrical current through a non-working set. You can start repairing your defective incandescent lights instead of trashing them. It makes 'dollars and sense' to easily repair a set as opposed to throwing it away. Essential for lighting professionals and crews, this little box will pay for itself in no time.
NOTE: To reduce possibility of electrical shock when using this machine, avoid holding the string of lights in your hands while testing. Extension cords sold separately.
This Light Tester is designed to work with incandescent mini light sets only. The light tester will only work with one string of lights at a time. When working with trees you must remove any tape and disconnect the clusters of plugs, in order to isolate the individual sets.
NOTE: To reduce possibility of electrical shock when using this machine, avoid holding the string of lights in your hands while testing.