The Extech GRT300-NISTL is a versatile ground resistance tester designed for professionals in electrical maintenance, grounding system installation, and troubleshooting. This handheld instrument combines accuracy, convenience, and essential features to provide reliable measurements of ground resistance and earth impedance.

The Extech GRT300 utilizes advanced testing methods to measure ground resistance in various grounding systems. It features three test methods: two-wire, three-wire, and four-wire measurement, allowing for flexibility in different grounding configurations. The instrument also provides measurements of soil resistivity, enabling a comprehensive assessment of the grounding system.

The tester features a clear LCD display that shows real-time measurement values, including ground resistance, soil resistivity, and other relevant parameters. It may include additional features such as data logging capabilities, allowing users to store and review measurement data for further analysis.

Designed for ease of use, the Extech GRT300 has a user-friendly interface and intuitive controls. It is typically powered by batteries, ensuring portability and allowing for on-the-go testing in different locations.

The Extech GRT300 is suitable for a wide range of applications, including electrical substations, power plants, industrial facilities, and telecommunications sites. Accurate measurement of ground resistance is essential for maintaining electrical safety, preventing electrical hazards, and ensuring efficient grounding system performance. It includes Limited NIST Certification.