In certain circumstances can not be found to be measured point and the need to break the wire jacket on the signal test, can easily use this tool, the plug is easy and common use of the table with a simple, safe and fast. Application scope:Match with the test lead of Multimeter or Oscilloscope for high voltage Connect method:4mm socket connection Product features:Sharp and hard stainless steel needle can easily pierce the surface of cable but doesn't destroy it.It can be widely used about the non-destructive cable test in Auto,Power,Industry Surface: nickel plated colour:Red+black Material:Copper + nylon size:136 x 4 x 23mm Package Contents: 2 x Red test clip 2 x Black test clip Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.