Bidirectional low-resistance pin

The utility model relates to a bidirectional low-resistance pin, which belongs to the technical field of pin detection and comprises a pin tube, fixing sleeves sleeved at two ends of the pin tube and a connecting piece arranged in the pin tube, the connecting piece divides an inner cavity of the pin tube into two symmetrical cavities, and an outer pin shaft and an elastic inner pin shaft are arranged in any cavity. The elastic inner needle shaft is arranged between the connecting piece and the outer needle shaft and abuts against the outer needle shaft from inside to outside, the tip end of the outer needle shaft telescopically penetrates through the fixing sleeve, and the elastic inner needle shaft abuts against the outer needle shaft so that the waterproof piece can be pressed to deform to fill the gap. The annular waterproof ring is arranged in the circular gap, and the annular waterproof ring is in contact with the needle tube, the outer needle shaft and the fixing sleeve, so that a good waterproof effect