The Extech GRT300 4-Wire Earth Ground Resistance Tester Kit measures in 4 ranges from 2 to 2000 Ohms and includes all hardware necessary to measure earth ground
This document provides technical specifications for the Extech GRT300 4-Wire Earth Ground Resistance Tester Kit. The device supports 4-wire, 3-wire, and 2-wire testing modes with a large dual line LCD display.
Key features include autoranging, automatic current and potential spike checks, test hold function, and automatic zero adjustment. It measures earth ground resistance in four ranges from 2 to 2000Ω.
| Test Current / Frequency | <2mA / 820Hz |
|---|---|
| AC Earth Voltage Range | 0 to 300VAC |
| Earth Ground Resistance Ranges | 2 Ω/20Ω/ 200Ω/2000Ω |
| Basic Accuracy | ±(2%rdg+3d) |
| Resolution | 0.01 Ω/ 0.1Ω/1Ω/0.01kΩ |
| 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) |
The device supports 4-wire, 3-wire, and 2-wire testing.
The kit includes test leads with alligator clips, 4 auxiliary earth bars, a hard carrying case, and eight 1.5V AA batteries.