Extech GRT300 Ground Resistance Tester
Starting at $819.00

Not in stock. Usually ships in 3-5 business days [?]

Need Help? Call 1-800-884-4967 8:00am to 5:30pm ET


  • Large dual line LCD
  • Autoranging
  • Automatic I (current) spike check
  • Automatic P (potential) spike check
  • Test Hold function for easy operation
  • Automatic Zero adjustment
  • AC Earth Voltage
  • Data Hold and Auto Power off
  • Overrange and low battery indication
  • CAT IV 300V rated

The Extech 4-Wire Earth Ground Resistance Tester measures ranges from 2Ω/20Ω/ 200Ω/2000Ω. It has a accuracy ±(2%rdg+3d) and a resolution of 0.01Ω/ 0.1Ω/1Ω/0.01kΩ. The Dimensions are 9.8 x 7.8 x 4.3" (250 x 190 x 110mm). Comes with NIST certification option.

The Extech 4-Wire Earth Ground Resistance Tester comes complete with:

  • alligator clips
  • 4 auxiliary earth bars
  • hard carrying case
  • eight 1.5V AA batteries