Electronic Specialties 181 Loadpro Bundle – Dynamic Test Leads And Fundamental Electrical Troubleshooting Book LOADpro Test Leads load the circuit to see if current can flow. LOADpro finds these problems FAST: High Corrosive Resistance Shorts to Ground Open Circuits By loading the circuit, LOADpro makes a voltage drop test on the fly. Just press the switch the test results can not lie. Use LOADpro w/your DMM and follow our test method – you will find wiring faults quicker. LOADpro Test Leads feature SteadyPin Probe Tips, which allows the probe to sit firmly on a male ECM or connector pin. LOADpro test leads are OEM approved finds corroded circuits! #182 FET book is 200 pages of basic electricity explained in a way that make it useful in the shop. Everything is covered, from batteries, to relays, to schematics its all in the book!