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  1. S

    BT 87J OSCILLATOR AND PROBE Help on its operation

    Hi Can anyone help? Got involved in a job where I have to identify 300 x BT and Cat5 cables. I had a cheap 'tone tester' from China, that lasted about a week, but has packed in. I have now bought a secod hand "BT 87J Oscillator and Probe", but I am a little unsure as to the correct way to...
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