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NL4 Sniffer/Sender
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Knowledgebase Cable Testers (Sniffers and Senders) NL4 Sniffer/Sender

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Can I test NL2 cables with the NL4 Sniffer/Sender?

While the NL4 Sniffer/Sender was not designed to test NL2 cables, you can use the tester on two wire cables. You will get a readout of "A=Green," "B=Red," "C=Green," and "D=Green." Alternatively, you ...
The LEDs on my NL4 Sniffer/Sender are showing all red when plugged into a good cable. Is it broken?

Typically this occurs when the batteries are put in backward. Reversing its position will return it to all green on a good cable.