Puncture Probe Wire-Piercing Test Clip 2PCS P5010 Automotive Test Lead Kit Auto Car Repairing Multimeter Testing Tool

I am unfamiliar with these. Once you hook the wire, do you push on what looks like a plunger? Are double male banana plug cables needed?

Is there a way to lock the probe once it pierces the insulation? It not, there won't be a free hand to start or stop the tested item??