Extech Resistance & Ground Testers
A reliable earth ground is the foundation of facility safety and equipment longevity. Without it, power surges, lightning strikes, and static buildup can cause catastrophic damage to heavy industrial machinery and electric panels. Extech provides highly accurate testing solutions to verify grounding systems and measure extremely low resistance values. Whether you are validating new telecom site grounds with a clamp-on tester, or utilizing 4-wire Kelvin clips to measure the exact resistance of transformer coils, motor windings, and PCB layouts, Extech meters deliver the precision required to maintain electrical integrity and compliance.
Earth Ground Resistance Testers
Verify the effectiveness of grounding rods, grids, and facility grounding infrastructure with contact and non-contact testing solutions.
GRT300 4-Wire Earth Ground Resistance Tester: A comprehensive, heavy-duty tester supporting 4-wire, 3-wire, and 2-wire earth resistance measurements. Features automatic I (current) and P (potential) spike check capabilities, internal memory for data storage, and test frequencies tailored to minimize electrical noise interference.
382252 Earth Ground Resistance Tester Kit: A complete, portable kit designed for standard 3-wire and 2-wire ground testing. Measures earth ground resistance up to 2000Ω and AC earth voltage up to 200V. Includes all necessary test leads, auxiliary earth bars, and a heavy-duty carrying case.
382357 Clamp-On Earth Ground Resistance Tester: The ultimate time-saver for existing installations. Allows technicians to measure earth ground resistance (from 0.025Ω to 1500Ω) safely without disconnecting the ground or driving auxiliary test spikes. Also measures leakage current up to 30A.
Micro-Ohm & Milliohm Meters
Achieve high-resolution, ultra-low resistance measurements for testing motor coils, transformers, circuit breakers, and specialized conductive materials.
UM200 High-Resolution Micro-Ohm Meter: A highly advanced meter built into a rugged, water-resistant field case. Provides extreme precision with 1µΩ resolution and a maximum test current of 10A. Features 6 measurement ranges and stores up to 3000 readings for field data logging.
380580 Battery Powered Milliohm Meter: A portable, battery-operated milliohm meter perfect for field use. Utilizes a 4-wire Kelvin clip testing method to completely negate lead resistance, providing highly accurate measurements across 5 ranges (from 200.0mΩ to 2000Ω).
380562 High-Resolution Milliohm Meter (220V): A precision benchtop meter engineered for 220V mains power, offering 7 measurement ranges for wide-spanning diagnostics. Features an extruded aluminum housing, a built-in comparator for Hi/Lo/Go sorting, and stable 4-wire Kelvin clip testing.
380462 Precision Milliohm Meter (220V): A highly reliable 220V benchtop milliohm meter designed for testing the resistance of coils, transformers, and PCB layouts. Features a manual zero display adjust and 100µΩ resolution on the lowest range for extreme benchtop precision.