The Extech GRT300 4-Wire Earth Ground Resistance Tester comes in 2 versions: Standard or NIST certified calibration. Pick your options above to open the exact model, with its own price and details. The details below are for the Standard version.
The Extech GRT300 4-Wire Earth Ground Resistance Tester is a professional-grade handheld instrument engineered for evaluating the integrity of grounding systems in critical electrical environments. Designed for use in electrical substations, industrial plants, telecom infrastructure, and field maintenance, it delivers accurate and reliable ground resistance and soil resistivity measurements.
Equipped with support for 2-wire, 3-wire, and 4-wire test methods, the GRT300 provides flexibility across various grounding setups. It ensures safety and reliability with features like automatic spike checks for current and potential leads, autoranging for efficient test performance, and a clear LCD display for real-time measurement data.
Additional user-friendly elements include a test hold function for easier operation, automatic zero adjustment, and built-in indicators for low battery and overrange conditions. Its portable, battery-powered design and rugged carrying case make it ideal for technicians performing on-the-go testing and analysis.
What's Included:
- 1 - Set of Test Leads With Alligator Clips
- 4 - Auxiliary Earth Bars
- 1 - Hard Carrying Case
- 8 - 1.5V AA Batteries
Features
Flexible Ground Testing
Supports 2-wire, 3-wire, and 4-wire testing for use across various grounding systems and site conditions.
Automatic Spike Check
Performs I (current) and P (potential) spike checks to ensure proper connection and testing accuracy.
Convenient Operation
Includes a Test Hold function that allows users to freeze readings for easy data review.
Smart Measurement Features
Equipped with autoranging, auto power-off, automatic zero adjustment, and data hold to enhance efficiency and usability.
AC Earth Voltage Measurement
Capable of measuring AC earth voltage to support complete grounding evaluations.
Battery and Overload Indicators
Alerts users to low battery or overrange conditions, preventing inaccurate results and interruptions in testing.
What's Included
Included with Your Purchase:
- 1 - Set of Test Leads With Alligator Clips
- 4 - Auxiliary Earth Bars
- 1 - Hard Carrying Case
- 8 - 1.5V AA Batteries
Specifications
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Model: GRT300
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Measurement Ranges: 2 Ω, 20 Ω, 200 Ω, 2000 Ω
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Test Methods: 2-wire, 3-wire, 4-wire
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Display: Large LCD
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Functions: Data Hold, Auto Zero, Auto Power Off, Autoranging
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Additional Measurements: AC Earth Voltage
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Indicators: Overrange, Low Battery
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Power Supply: 8 x 1.5V AA Batteries
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Condition: NEW
FAQ
Q: What types of grounding systems can the Extech GRT300 test?
A: It supports 2-wire, 3-wire, and 4-wire configurations, making it suitable for various grounding systems and environments.
Q: Can the tester measure soil resistivity?
A: Yes, the GRT300 includes functionality to assess soil resistivity as part of a complete grounding evaluation.
Q: Is the device portable for field use?
A: Absolutely. It’s battery-powered and comes with a durable hard carrying case for on-site convenience.
Q: Does the device warn of low battery levels?
A: Yes, it features low battery and overrange indicators to prevent inaccurate readings.
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