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Voltage tester, tick-tracer, glow-tip, non-contact voltage tester... whatever. Same thing. I call it a voltage sniffer, but the technical name for this device is a capacitive voltage sensor. That's a ...

Fig 1. The voltage measurement circuit includes the ability to test secondary voltages of either polarity for deviations of 1%, 3%, 5%, and 10%. Fig 2. The schematic of the secondary-voltage tester ...