Success Probability of TWW jumper cables

Gameplay Professions
1

For TWW there is the new ‘Convincingly Realistic Jumper Cables’, which can be used by non-engineers. Is the probability of success for the item known for non-engineers? Is it a 100% success chance for an engineer?

2

Also curious about this question.
Wondering also if they are affected by Tinker tree of knowledge points

3

I’m also wondering if they are affected by the Tinkers spec

4

When are they gonna add jumper cables on a stick as a weapon?