The Megger GA-90000 two-piece test Kelvin probe cable kit includes two 4' (1.3 m) test cables for use with the Megger MOM2 microhmmeter or other compatible low-resistance ohmmeters. Both cables have a Kelvin probe on one end for taking four-wire resistance measurements, which are more accurate than two-wire resistance measurements and allow low resistance values to be detected. The Kelvin probe is held against the device to be tested. One Kelvin probe has a trigger button to allow reading to be taken without pressing a button on the meter.

A test probe, test lead, test prod, or scope probe transmits an electrical signal to a testing device for display and analysis. Designs range from simple test leads with probe-style or clamp-on tips to more complex oscilloscope probes and current detectors. Some test probes, such as basic test leads, have wires with tips for connecting to test equipment. Other test probes, such as voltage detectors, are built into the meter. Depending on what is to be tested, the probe might either be passive or have active parts that require external power to operate. Some probes require contact for testing, while some are capable of taking measurements from a distance. Some also have finger barriers, insulation, or other features to help protect the operator's hand from electrical shock and burns. Test probes are rated according to the amount of voltage, current, temperature, or other input they can measure. When choosing a test probe, the maximum amount of input that the probe can measure should match or exceed both the maximum amount that can be tested by the test equipment, as well as that of the property expected to be present in the application.