The Auto Test Cable (HT30A) is a kind of special line for assisting automobile measurement instruments to test various types of signals.
It's about 3 meter in length allows the oscilloscope to be placed on the work bench away from the car being tested or repaired.
It consists of wide range probes, clips, gators can be plugged into the 4 mm connectors at the end of the cable.
It adopts full shield which can help reduce the noise interference.
To avoide the lines twisting together, the two pieces of lines with connectors are not the same in length.
The short line is earth wire, and the long line is positive pole which should be connected with the auto engine cable, which also can cooperate with a 20:1 attenuator.