4-Wire Earth Ground Resistance Tester Kit Includes all hardware necessary to measure earth ground In 4 ranges from 2 to 2000Ω Features: • 4-wire, 3-wire, and 2-wire testing • Large dual line LCD • Autoranging • Automatic I (current) spike check • Automatic P (potential) spike check • Test Hold function for easy operation • Automatic Zero adjustment • AC Earth Voltage • Data Hold and Auto Power off • 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 Specifications Earth Ground Resistance ranges Basic Accuracy Resolution Test Current / Frequency AC Earth Voltage / Frequency Accuracy Power supply Dimensions Weight 2Ω/20Ω/ 200Ω/2000Ω ±(2%rdg+3d) 0.01Ω/ 0.1Ω/1Ω/0.01kΩ <2mA / 820Hz 0 to 300VAC / 40 to 500Hz ±(2%rdg+3d) Eight 1.5V ‘AA’ Batteries 9.8 x 7.8 x 4.3" (250 x 190 x 110mm) 3.15lbs (1430g) (batteries included) Ordering Information: GRT300 ..............4-Wire Earth Ground Resistance Tester Kit GRT300-NISTL* ..GRT300 with Certificate Traceable to NIST 382153................Replacement Earth Bars (2pk) 382154................Replacement Set of Leads *Limited NIST for Certificate of Traceability to 4-wire mode only www.extech.com Specifications subject to change without notice. 6/16/11 - R1 Copyright © 2010-2011 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.