Insulation resistance testers, also known as megohmmeters, are essential tools for evaluating the integrity of electrical insulation in wires, motors, transformers, and other electrical equipment. By applying a controlled voltage and measuring resistance in megaohms (MΩ), these devices help detect insulation breakdown, prevent electrical failures, ensure safety, and maintain compliance in industrial and commercial applications.
Insulation resistance testers are widely used in electrical maintenance, troubleshooting, and safety compliance across various industries. Key applications include:
By identifying insulation degradation early, these testers help reduce downtime, improve reliability, and enhance workplace safety.
Ideal for low-voltage systems, wiring, and general electrical maintenance.
- Suitable for residential, commercial, and light industrial applications.
- Commonly used for testing small motors, control circuits, and appliances.
Designed for mid-range insulation testing in industrial settings.
- Used for motors, transformers, cables, and switchgear.
- Provides a higher test voltage for detecting insulation breakdowns.
Recommended for high-voltage equipment in heavy industries.
- Ideal for power distribution systems, substations, and large motors.
- Ensures insulation integrity in critical infrastructure.
Best for high-power electrical assets and demanding environments.
- Used in utility, oil & gas, and high-voltage transmission systems.
- Provides deep insulation analysis for large transformers and high-capacity electrical networks.
The Fluke 1503 is a great choice for basic residential and commercial electrical insulation testing. This rugged, compact tool fits in the palm of your hand. The 1503 is the same form factor as the Fluke 1507 but with a few less features. You can count on it to handle the most common tests at a most affordable price. Additional features, like the remote probe, reduce the time needed to perform repetitive testing.
Other useful capabilities:
Take advantage of the 1507 full feature set to easily and quickly perform advanced insulation resistance testing. Its handy size and light weight make it easy to pack and use. Additional features, like the remote probe, save both time and money especially when performing repetitive tests. And its reasonable price and rugged reliability make it an excellent value.
Other Useful Capabilities
Fluke Connect + Fluke's 1587 FC Insulation Multimeter helps you identify tough problems, fix, and wirelessly communicate your work quickly and easily - all at a safe distance. The Fluke 1587 FC is Fluke Connect-enabled so you can download the free Fluke Connect® Measurements app to your smartphone and gain additional functions.
Other useful capabilities:
The TM 507 is an excellent choice for professionals who need a compact, high-performance insulation tester for a wide range of electrical applications. Designed for both residential and industrial use, this rugged tool provides accurate insulation resistance measurements while ensuring safety and ease of operation. The TM 507 offers a user-friendly interface with essential features for reliable and efficient testing at an affordable price.
Other useful capabilities:
With user selectable test voltages from 250 V to 2,500 V and resistance measurements up to 500 GΩ these testers allow you to cover more workload with a single tool. Equipped with an intuitive user interface, a short circuit current of up to 5 mA and a CAT IV 600 V rating these portable high-voltage insulation testers can deliver rapid and stable resistance measurements no matter where you take them. The 1537 Insulation Resistance Tester also allows you to store measurements for later review or PC transfer, using the provided software.
The Fluke 1550C performs digital insulation testing up to 5 kV, and makes data collection easy through the Fluke Connect™ wireless app. Remote operation lets you spend as little time as possible in potentially hazardous zones. Real-time trending shows a live graph on your phone, rather than a hard-to-read set of changing values. And you can create reports quickly, using pre-designed templates that you can customize with company logos. It’s the perfect tool for preventive or predictive maintenance programs designed to identify potential equipment failures before they occur. And it comes with a three-year warranty and CAT IV 600 V safety rating.
Other useful features:
The Fluke 1555 insulation resistance tester offers digital insulation testing up to 10 kV, making it ideal for testing high voltage equipment including switchgear, motors, generators and cables.
Data collection is easy using the Fluke Connect® wireless app. Remote operation lets you spend as little time as possible in potentially hazardous zones. Real-time trending shows a live graph on your phone, rather than a hard-to-read set of changing values. And you can create reports quickly, using pre-designed templates that you can customize with company logos. The 1555 insulation tester can now conduct the entire range of test voltages specified in IEEE 43-2000 with a best in class, 3 year warranty and CAT IV 600 V safety rating.
Other useful features:
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