Megger Probe and Crocodile Clip Set is recommended for use with 1001-991 (3-wire lead set for MFT1700/MFT1800 multifunction installation testers), 1001-975 (fused 3-wire lead set for MFT1700/MFT1800 multifunction installation testers). It includes crocodile clips (red, blue and green), GS38 probe tips (red, blue and green) plus extended probes (red and blue).