The GRT350 is a 4-wire earth ground resistance and resistivity tester which measures earth ground resistance from 2 to 2000 Ohm and resistivity from 0.06 to 628 ohm-m. The GRT350 supports 4-wire, 3-wire, and 2-wire testing. This tester has a large dual line LCD, automatic spike check, test hold function, auto ranging, data hold and auto power off. The GRT350 can also store and recall up to 200 test results, has over-range and low battery indications.

To ensure good ground system installation, use Extech’s GRT350 Tester to check the resistance of the ground as well as the soil resistivity before you install your ground rods. This tester includes all hardware necessary to measure Earth Ground Resistance in 3 ranges, from 20 to 2000Ω, and Resistivity from 0.06 to 628kΩm. Electricians and technicians should also check their ground system periodically for predictive maintenance ensuring the resistance level doesn’t exceed the allowed safety level.