Low Resistance Testing Solutions

Fast, accurate low-resistance measurements for critical power, rail, and industrial applications.

Measuring low resistance is essential for preventing overheating, energy loss, and equipment failure in electrical systems. Whether you're validating circuit breaker contacts, checking busbar joints, confirming cable bonding integrity, or ensuring rail safety, Megger low-resistance testers, including low resistance ohmmeters, provide fast and accurate results. Designed for substation, rail, industrial, and manufacturing environments, they deliver stable readings even in high-noise conditions. With the addition of CertSuite Asset, you can store, trend, analyse, and report results with confidence—supporting proactive maintenance and reliable asset performance.

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Megger low resistance ohmmeter used for low resistance testing in outdoor field conditions.

All Electrical resistance testing Ground systems testing Low resistance testing

247000 digital low resistance ohmmeter

MJÖLNER600

600 A micro-ohmmeter with DualGround safety

Accurate results you can trust

Low resistance measurements must be stable, repeatable, and immune to external influences. Megger’s DLRO and MOM instruments use high-current, true four-wire Kelvin techniques to overcome lead resistance, oxidation, contamination, and thermal EMF effects. Advanced filtering, bi-directional testing, and rapid measurement modes ensure precise readings across all applications—from commissioning to routine maintenance and diagnostics.

Built for demanding environments

Megger instruments are designed for real-world challenges. Whether testing in a substation, rail corridor, switchyard, industrial plant, or during overnight maintenance, our low-resistance testers deliver reliable performance. Rugged housings, IP-rated construction, and heavy-duty variants such as the DLRO10HD ensure dependable operation in poor weather, confined spaces, and high-risk locations.

Prevent failures and reduce energy loss

High resistance at joints or terminations can lead to dangerous heating, increased losses, and unexpected equipment outages. Megger instruments help you detect these issues early. Identifying deteriorating bonds, high-resistance contacts, or weak conductive paths supports safer operation, higher system efficiency, and reduced downtime—protecting assets and improving long-term reliability.

Smarter reporting with CertSuite Asset

CertSuite Asset enhances your testing workflow with structured data capture, automatic asset records, and cloud-based reporting. Log test results, track trends over time, and build digital evidence trails for compliance and maintenance planning. It’s a powerful way to integrate low-resistance testing into broader asset management programs.

Frequently asked questions

What is low resistance testing used for?

Low resistance testing verifies the integrity of electrical connections, conductors, bonding, and contacts. It helps identify corrosion, loose joints, contamination, or faults that can lead to overheating, failures, or safety hazards.

Which Megger instrument should I use for low-resistance testing?

For general continuity and bonding tests, DLRO10 or DLRO10X provide fast, portable measurements. For heavy-duty field environments, DLRO10HD delivers higher durability and noise immunity. High-current applications such as breaker contact resistance testing are best performed with MOM2, MOM600A, or DLRO100 series instruments.

Why is low resistance testing important in rail systems?

Rail applications rely on effective bonding and grounding to manage traction return currents, lightning protection, signalling continuity, and step/touch voltage safety. Routine low-resistance testing, often carried out using low resistance ohmmeters, helps prevent service disruptions and safety risks.

What causes high resistance at electrical joints?

Common causes include oxidation, corrosion, mechanical stress, contamination, loose fittings, thermal cycling, vibration, or damaged strands. Regular testing helps identify these issues before failures occur.

Explore our low-resistance testing range

From handheld low resistance ohmmeters (micro-ohmmeters) to high-current circuit breaker testers and digital reporting tools, Megger offers a complete portfolio for low-resistance testing across power, rail, industrial, and OEM environments. Compare features and find the right instrument for your maintenance and diagnostic needs.

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