This 8 level tester will show just how much power is going through the line.
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Stick the prong into the ground and touch a conducting line with steel top of the tester to allow the power to flow through. The lights will flash on very pulse to show how much power is going through the line.
This works the same as our 5 level tester but the display shows the power to higher levels and the casing is a lot sturdier.