Amprobe DGC-1000A [2731217] Clamp Ground Resistance Tester . The Amprobe DGC-1000A clamp-on ground resistance tester takes accurate ground resistance measurements from 0.025 to 1500 Ohms and TRMS current measurement including leakage current. The meter takes accurate readings in less than 10 seconds.The Amprobe DGC1000A clamp-on ground resistance tester is simple and easy to use. The tester has data logging capabilities for 116 records as well as individual data point recording, user selectable high & low ohm audible alarms, auto power off, a low battery indicator and a large LCD display. The DGC-100A is user-friendly and accurate. Think safety and Amprobe’s DGC-1000A ground resistance tester second. Use the on-board memory and data logging features to make your work more efficient.