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non contact mains tester

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gentone | 20:38 Thu 26th Aug 2004 | How it Works
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how does a non contact mains tester work
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Avatar Image Mortartube
By the magnetic field around a cable etc. Electricity flowing through a cable will make a magnetic field and if you put a Voltstick etc in the field, the magnetism affects the internal circuitry and makes the LED glow inside.
22:59 Thu 26th Aug 2004

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non contact mains tester

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