WL-001 DUOYI DY4100 DIGITAL EARTHING RESISTANCE TESTER is a device used to check the safety and accuracy of earthing systems. This device is often used in electrical wiring installation, industrial plants, laboratories and other similar areas. The DY4100 model is usually designed to measure the grounding resistance. Grounding is a safety measure used to reduce dangerous voltages in electrical systems. Therefore, accurate measurement of grounding resistance is important and critical to electrical safety. The instrument usually has a number of features, including high-precision measurements, wide measurement range, user-friendly interface and data logging capability. Furthermore, the instrument usually has a portable and rugged design, making it suitable for field work.