This tester differentiates itself from the competition by being sensitive to lower voltages than most, making it useful for diagnosing 12V and 24V AC cables as well as higher AC voltages. It doesn't work with constant voltage. His pen is also narrow enough to fit into the socket to determine his condition. Apparently others didn't think this through and used wider buttons. Because of its sensitivity, I can be sure that if it doesn't read voltage near isolated circuits, those circuits are dead. This allows me to consciously trace de-energized circuits through hidden areas to find out where they reappear and what they serve from within the maze of parallel circuits. It also helped find faulty Christmas tree lights in those damn chains killing 30 or more LED lights at once with one broken wire. Good light bulbs have power on both sides if everything is ok and the cord from the plug is live. It's small and I often lose things like this, so this time I took two.
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