Just placed an order for these E-Z-HOOK's. I ordered a 48" & 72" but you can get about any length. I previously used these on my day job.
Use these to jumper across electrical circuits in an em pinball machine to troubleshoot - prove good to a certain relay or connection on certain problems.
Simply push the thumb button to expose a spring hook and clip wherever you want to test. Release thumb button to "lock on" to your test point.