PRODUCT DATASHEET
Features
PRODUCT DATASHEET
GRT350 4-Wire Earth Ground
Resistance/Resistivity Tester
Features
• Earth resistivity (r) test
• 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
• AC Earth Voltage
• Data Hold and Auto Power Off
• Overrange and low battery indication
• Store/recall up to 200 test results
• Complete with built-in hard carrying case, test leads
with alligator clips, 4 auxiliary earth bars, and eight
1.5V AA batteries
Ordering
GRT350* N ................4-Wire Earth Ground Resistance/Resistivity Tester
382153.........................Replacement Earth Bars (2pk)
382154.........................Replacement Set of Leads
www.extech.com
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
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
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.
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
UPC Code: 793950383155
