PRODUCT DATASHEET GRT350 4-Wire Earth Ground Resistance/Resistivity Tester 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. Features • Earth resistivity (r) test • AC Earth Voltage • 4-wire, 3-wire, and 2-wire testing • Data Hold and Auto Power Off • Large dual line LCD • Overrange and low battery indication • Autoranging • Store/recall up to 200 test results • Automatic I (current) spike check • Complete with built-in hard carrying case, test leads • Automatic P (potential) spike check with alligator clips, 4 auxiliary earth bars, and eight • Test Hold function for easy operation 1.5V AA batteries Specifications Earth Ground Resistance 20Ω/200Ω/2000Ω Accuracy ±(2%rdg+3d) Resolution 0.01Ω/ 0.1Ω/1Ω Test Current / Frequency approx. 2mA/820Hz Earth Resistivity (r) 0.06 to 6.28 kΩm, 0.62 to 62.8 kΩm, 6.28 to 628 kΩm AC Earth Voltage 0 to 300VAC Accuracy ±(2%rdg+3d) Dimensions 9.8 x 7.8 x 4.3" (250 x 190 x 110mm) Weight 3.15lbs (1.43kg) - batteries included Ordering GRT350* N.................4-Wire Earth Ground Resistance/Resistivity Tester 382153.........................Replacement Earth Bars (2pk) 382154.........................Replacement Set of Leads N Indicates products that are available with optional calibration traceable to NIST. Order with -NISTL after part number. *Limited NIST for Certificate of Traceability to 4-wire mode only Specifications subject to change without notice. Copyright © 2014-2015 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form. Rev. 4/13/15 UPC Code: 793950383155 www.extech.com