DUOYI DY4200 Car Higher Accuracy Digital Ground Resistance Tester1. The digital ground resistance tester improves the circuit, structure and technology of the traditional ground resistance tester, and the design is both beautiful and practical. 2. The machine has more complete functions, higher precision, more convenient and reliable operation, and is more suitable for outdoor use with a dust proof and moisture proof structure. 3. It can test the grounding resistance of various grounding systems, including power