Extech 4-Wire Earth Ground Resistance Tester Kit

Extech 4-Wire Earth Ground Resistance Tester Kit


The Extech 4-Wire Earth Ground Resistance Tester Kit measures earth ground in 4 ranges from 2 to 2000Ω.


  • 4-wire, 3-wire, and 2-wire testing
  • Automatic I (current) spike check
  • Automatic P (potential) spike check
Free Shipping on this product
Your Price
Drop ships from manufacturer

Shipping Information
Return Policy
Why Buy From Fondriest?


The Extech 4-Wire Earth Ground Resistance Tester Kit includes all the hardware necessary to measure earth ground in 4 ranges from 2 to 2000Ω. The kit includes 4-wire, 3-wire, and 2-wire testing. The large dual line LCD displays autoranging, automatic I (current) spike check, and an automatic P (potential) spike check.

Notable Specifications:
  • Earth ground resistance ranges: 2Ω/20Ω/200Ω/2000Ω
  • Basic accuracy: +/-(2%rdg+3d)
  • Resolution: 0.01Ω/0.1Ω/1Ω/0.01kΩ
  • Test current/frequency:< 2mA/820Hz
  • AC earth voltage/frequency: 0 to 300VAC/40 to 500Hz
  • Accuracy: +/-(2%rdg+3d)
  • Power supply: eight 1.5V AA batteries
  • Dimensions: 9.8x7.8x4.3" (250x190x110mm)
  • Weight: 3.15lbs (1430g) (batteries included)
What's Included:
  • (1) Earth ground resistance tester
  • (4) Test leads with alligator clips
  • (4) Auxiliary earth bars
  • (8) 1.5V AA batteries
  • (1) Hard carrying case
Image Part # Product Description Price Stock Order
Extech 4-Wire Earth Ground Resistance Tester Kit GRT300 4-Wire earth ground resistance tester kit
Drop ships from manufacturer
Extech 4-Wire Earth Ground Resistance Tester Kit GRT300-NISTL 4-Wire earth ground resistance tester kit, NISTL traceable
Drop ships from manufacturer

In The News

Algae Bloom Spawns New Water Monitoring Program In Utah Lake

The result of a harmful algae bloom in the summer of 2016, the enhanced Utah Lake water quality monitoring program, reached its one year milestone in September. Located near the Provo and Orem metropolitan areas, the lake is Utah’s largest freshwater body and a popular water recreation and fishing spot. In the summer of 2016, recreation users reported an unusual amount of scum on the surface of the water. Utah Lake is monitored by the Utah Division of Water Quality (UDWQ). Prior to the 2016 harmful algae bloom (HAB), the UDWQ successfully used regular water sample testing and citizen reporting to stay on top of any incidents.

Read More

Data Buoys Study Turbid Water Environments in Lake Erie Basin

What started as a study into a relatively unexamined type of cyanobacteria has turned biologists from Bowling Green State University into an integral part of the effort to monitor and protect the drinking water in Sandusky, Ohio. Dr. George Bullerjahn, the Professor of Research Excellence at Bowling Green State University, has done considerable work in the study of beneficial cyanobacterial organisms in the eastern and central basins of Lake Erie. His current project is focused on the growth of the toxic cyanobacterium Planktothrix in Sandusky Bay. Over the course of his career Bullerjahn has collaborated with Dr. Steven Wilhelm from the University of Tennessee.

Read More

Bottom Composition Matters, Underwater Cameras Can Help

As a pro angler, I use my Lowrance electronics every single time I am on the water. They are great at locating fish and structure, but when combined with my FishSens SondeCAM HD Underwater Camera they can show everything. A camera is a great tool for someone who wants to better understand what they are seeing on their electronics and for me, it helps get a clear picture of one of the most important things in bass fishing: bottom composition. Hard Spots Hard bottoms are usually the best, and bass will relate to hard bottoms of different types depending on the region. My Lowrance StructureScan will show hard bottoms as bright, white areas on the screen where softer bottoms will be more grayish.

Read More