This is a great tool to use when there is a break in the circuit due to a bulb that is out. Use the light tester to locate the problem bulb. Once the problem bulb is replaced, the entire string will light.
This product is VERY cheaply made. Does not work as advertised (even after buying new and expensive replacement batteries (and YES, they were the right type of batteries!). Plain and simple, this product does not work as advertised. Avoid.
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