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Dual continuity tester:

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Dual continuity tester:
The article describes an instrument that is likely to become a standard unit in the toolbox of many electronics technicians. It functions not only as a standard acoustic continuity tester but also as a kind of wireless speedtester with which it suffices to merely touch the device to be tested with a finger. Its user friendliness is further enhanced by its knob-Iess switch-on system and an economizing automatic switch-off system.
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