Extech Ground Resistance Tester Kit 4-Wire - GRT300

In stock

This ground resistance test kit features up to 4 point testing for a better resistance picture. With a large range from 2 to 2000 ohms this test kit encompasses all earth resistances typically found.

Extech Ground Resistance Tester Kit 4-Wire - GRT300

Includes all hardware necessary to measure earth ground in 4 ranges as well as AC earth voltage


  • 4-wire, 3-wire and 2-wire testing
  • Large dual line LCD
  • Autoranging
  • Automatic I (current) spike check and Automatic P (potential) spike check
  • Test Hold function for easy operation
  • Tests AC Earth Voltage
  • With data hold and auto power off features
  • Over-range and low battery indication
  • 1 year warranty

Ground resistance is the capacity of the ground to accept an electrical charge flowing through it. This is vital to the safety of electrical systems around the world. Whether electricity is flowing through a neutral conductor back to the power producer or being directed literally into the earth, grounding capabilities must be large enough to accept the entire charge safely.

This all inclusive device enables multiple point testing to establish a better grounding grid. With 4, 3 and 2 wire testing for a multi-dimensional view of the grounding potential. This meter is built into a rugged, water tight casing for use in all sorts of weather. This ground resistance tester kit has 4 ranges of use which are 2, 20, 200 and 2000 ohms. It also includes 4 long test leads and 4 earth bars for driving into the ground.

To ensure a correct reading this meter features an automatic current spike check and an automatic potential spike check. The GRT300 Ground Resistance Tester User Manual is attached to this page to answer any further questions.


  • Earth Ground Resistance ranges: 2Ω/20Ω/ 200Ω/2000Ω
  • Basic Accuracy: ±(2%rdg+3d)
  • Resolution: 0.01Ω/ 0.1Ω/1Ω/0.01kΩ
  • Test Current / Frequency:
  • AC Earth Voltage / Frequency: 0 to 300VAC / 40 to 500Hz
  • Accuracy: ±(2%rdg+3d)
  • Power supply: Eight 1.5V ‘AA’ Batteries
  • Dimensions: 9.8 x 7.8 x 4.3" (250 x 190 x 110mm)
  • Weight: 3.15lbs (1430g) (batteries included)

Unit Ship Weight: 4.5

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