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4-Wire Earth Ground Resistance Tester

Extech GRT300

Model: GRT300 Go to Product Support
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The GRT300 measures earth ground in 4 ranges from 2 to 2000 Ohm. 4-wire, 3-wire, and 2-wire testing. Large dual line LCD. Automatic I (current) and P (potential) spike check. Test Hold function for easy operation. Autoranging, Automatic Zero adjustment, Data Hold and Auto Power off. AC Earth Voltage. Overrange and low battery indication. Complete with test leads with alligator clips, 4 auxiliary earth bars, hard carrying case, and eight 1.5V AA batteries.

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General Specifications
Earth Ground Resistance
Earth Ground Resistance Basic Accuracy
±(2% of reading + 3 digits)
Earth Ground Resistance Max Resolution
Earth Voltage
0 to 300VAC (40 to 500Hz frequency)
Earth Voltage Basic Accuracy
±(2% of reading + 3 digits)
Test Current
Test Frequency
Additional Details
9.8 × 7.8 × 4.3" (250 × 190 × 110mm)
8 × AA (1.5V) batteries
Safety Category
CATIV - 300V
2 years
3.15lbs (1430g)
Related Documents
Export Restrictions

Export Restrictions

The information contained in this page pertains to products that may be subject to the International Traffic in Arms Regulations (ITAR) (22 C.F.R. Sections 120-130) or the Export Administration Regulations (EAR) (15 C.F.R. Sections 730-774) depending upon specifications for the final product; jurisdiction and classification will be provided upon request.

Extech GRT300 - Model: GRT300

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