Vintage radio test scope demodulator probe.  Unbranded.  This item has a male 3 pin XLR like connector and Meuller Electric alligator clip, and was made in the United States. It is perfect for those interested in other vintage test equipment.

Metal tube on probe measures 4 1/2" in length (without the tip) and is 1" in diameter

Untested but looks to be in good shape.  Cord is still flexible and jacketing is not cracked or frayed