Triplett Fox & Hound Jr. – PN: 3375 - Manual (Page 27)

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If tracing a pair of wires, such as those used for
a telephone line, a lineman’s talkset (also called
a “handset”, “buttset”, or “craftset”) can be used
to positively identify the pair. Connect the sus-
pect pair to the talkset. If you have located the
target pair, the FOX Jr warble TONE will be heard,
strong and clear, in the earpiece of the talkset.
(See Figure 4)
TALK SET
MULTI-CONDUCTOR
CABLE
Figure 4 Wire Tracing with a Talkset