This is the addon parts set for the signal tracer/injector pen.
Get a real test pin (with spring) and a test clamp as well as male and female 2.1mm DC connectors to make yourself a T-power splitter.
Signal Tracer/Injector Pen.
Get this thing to easily debug any pedal you have in your “need to fix” pile.
Comes pro-assembled with all SMD parts. You only need to solder the switches and the loudspeaker that is included in the kit! Just do the wires.
Special kit available that has a real testing pin and a signal injector clamp as well as 2.1mm male and female power connectors to make a super helpful T-cable for your DC power.