Kastar, Lang Tools, and S&G Tool Aid all offer 30-foot retractable test leads that are fantastic
Test leads will handle up to 10 amps and stretch to 30 feet
when you need jumper wires to test electrical components on opposite ends of a machine.
The test leads will handle up to 10 amps, stretch to 20 feet, but reel back into a hand-size housing for tidy storage. A two-wire unit is available, but only stretches to 15 feet.
Cost ranges from $15 to $30, with quality paralleling price.
— Dan Anderson