AEMC 2118.77 Spring Loaded Kelvin Probes, 10A, 10ft. The AEMC 211877 10 A Rotating Spring Loaded Pencil Point Kelvin Probes can be used with any micro-ohmmeter that has binding posts from 4mm to 6mm in diameter or safety terminals 4mm in diameter. The test probe is useful for very accurately measuring a low resistance, and the AEMC 211877 Pencil Point probe improves contact by removing a thin layer of rust, paint, or dirt. When the user presses on the probes, they rotate as they retract. Measurements are made in 4-wire mode, making lead resistance compensation unnecessary. The AEMC 211877 probe is thicker, allowing for more "rugged" usage.