Triplett Analog Telephone Analyzer, 1980's
One of the secrets that many TSCM and countermeasures sweep teams employ is the use of standard telephone repair gear to sweep a telephone line. The above is a Triplett Telephone Analyzer that is good for such a job! Using them is a little complicated and requires an actual knowledge of telephone lines. This analog analyzer has been made for 20 years and gets updated a lot. You can still obtain these today from Triplett.

From The Ralph D. Thomas PI Vintage Collection
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