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Deluxe Heathkit T-2 Signal Tracer test probe. The Heathkit T-2 uses a single test probe for both audio and RF tracing - this is a simple probe with a single 1N34A diode installed in the probe. The original instructions specify shielded cable for the leads, the original supplied wire was a coaxial microphone style wire, many people use either standard (unshielded) test probe wire for the leads or a shielded coaxial cable, I use shielded black RG174 for the leads and Black test probe wire for the ground.
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