The 242011-18 duplex test lead with helical spring-point duplex hand spikes is for use with Megger 247100, 247101, DLRO10HD, DLRO10, and DLRO10X digital low-resistance ohmmeters. This duplex test lead measures both current and resistance when taking four-wire resistance measurements, which are more accurate than two-wire resistance measurements and allow low resistance values to be detected. The lead has a maximum test current input of 10 amp.