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Insulation Resistance Testers or Megohmmeters

What are they?

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.

Applications

Insulation resistance testers are widely used in electrical maintenance, troubleshooting, and safety compliance across various industries. Key applications include:

  • Power & Utilities – Testing transformers, switchgear, and circuit breakers.
  • Oil & Gas – Ensuring insulation integrity in hazardous environments.
  • Manufacturing & Industrial Plants – Preventing equipment failures in motors and generators.
  • Construction & Facility Maintenance – Verifying wiring and insulation health in buildings.
  • Renewable Energy – Assessing insulation in solar panels and wind turbines.

By identifying insulation degradation early, these testers help reduce downtime, improve reliability, and enhance workplace safety.

Product Categories

1kV Insulation Testers

2.5kV Insulation Testers

2.5kV Insulation Testers

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.

Explore the 1kV Product Range

2.5kV Insulation Testers

2.5kV Insulation Testers

2.5kV Insulation Testers

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.

Explore the 2.5 kV Product Range

5kV Insulation Testers

10kV Insulation Testers

10kV Insulation Testers

Recommended for high-voltage equipment in heavy industries.


- Ideal for power distribution systems, substations, and large motors.

- Ensures insulation integrity in critical infrastructure.

Explore the 5kV Product Range

10kV Insulation Testers

10kV Insulation Testers

10kV Insulation Testers

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.

Explore the 10kV Product Range

1kV Insulation Testing Product Range

Fluke 1503

Fluke 1503

Fluke 1503

Fluke 1503 insulation resistance tester or megohmmeter for insulation testing

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:

  • Measures AC/DC voltage from 0.1 V to 600 V
  • Includes auto-discharge of capacitive voltage for added user protection
  • Provides lo-ohms earth-bond continuity (200 mA)
  • Simplifies repetitive or hard-to-reach testing with the remote test probe
  • Features CAT IV 600 V overvoltage category rating
  • Accepts optional Fluke TPAK magnetic hanging system to free your hands for other work

Fluke 1507

Fluke 1503

Fluke 1503

Fluke 1507 insulation resistance tester or megohmmeter for insulation testing

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

  • Performs insulation tests from 0.01 MΩ to 10 GΩ
  • Includes live circuit detection to prevent insulation test if voltage >30 V is detected
  • Includes auto-discharge of capacitive voltage for added user protection
  • Measures AC/DC voltage from 0.1 V to 600 V and resistance from 0.01 Ω to 20.00 kΩ
  • Simplifies repetitive or hard-to-reach testing with the remote test probe
  • Features CAT IV 600 V overvoltage category rating
  • Accepts optional Fluke TPAK magnetic hanging system to free your hands for other work

Fluke 1587

Fluke 1587

Fluke 1587

Fluke 1587 insulation resistance tester or megohmmeter for insulation testing

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:

  • Safety first. Keep yourself out of harm’s way by monitoring your test measurements remotely.
  • PI/DAR timed ratio tests with TrendIt™ graphs to identify moisture and contaminated insulation problems faster
  • Temperature compensation to establish accurate baselines and relevant historical comparisons
  • Includes live circuit detection to prevent insulation test if voltage >30 V is detected
  • Incorporates VFD low-pass filter for accurate variable frequency motor drive measurements
  • Measures ac/dc voltage, dc millivolts, ac/dc milliamps, resistance, and continuity
  • Includes capacitance, diode test, temperature, min/max, frequency measurements and insulation test smoothing reading

TM 507

Fluke 1587

Fluke 1587

TM 507 insulation resistance tester or megohmmeter for insulation testing

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:

  • 3 3/4 digit LCD display.
  • Automatic Polarity Indication.
  • Low battery indication.
  • Measures high insulation resistance with auto range:
    250V: 4MΩ to 1000MΩ.
    500V: 4MΩ to 2000MΩ.
    1000V: 4MΩ to 4000MΩ.
  • Measures AC and DC voltages: 0V to 600V.
  • Function Keys: POWER, GO, ZERO, LOCK, BACKLIT.
  • Continuity Test.
  • Auto Discharge.
  • Auto Power Off.

2.5kV Insulation Testing Product Range

Fluke 1537

Fluke 1537 insulation resistance tester or megohmmeter for insulation testing

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.

  • Selectable Voltage Tests: Tailor your tests with user-selectable voltages of 250 V, 500 V, 1000 V, and 2500 V to cover both industrial and solar applications.
  • Extended Insulation Resistance Measurement: Reach up to 500 GΩ in insulation resistance measurement for a thorough analysis.
  • Intelligent Calculations: Automatically calculate Polarization Index (PI) and Dielectric Absorption Ratio (DAR), minimizing the influence of environmental factors.
  • High Measurement Capacity: Execute up to 1,300 measurements at 2,500 V or 6,500 measurements at 250 V on a single charge, enhancing productivity.
  • Enhanced Safety Features: Benefit from a CAT IV 600V rating and a built-in voltage alarm function for heightened safety during operations.

5kV Insulation Testing Product Range

Fluke 1550 FC

Fluke 1550 FC insulation resistance tester or megohmmeter for insulation testing

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:

  • Automatic calculation of Dielectric Absorption (DAR) and Polarization Index (PI) with no additional setup
  • Guard system eliminates the effect of surface leakage current on high-resistance measurements
  • Selectable test voltages in 50 V steps from 250 V to 1000 V, and 100 V steps above 1000 V
  • CAT III 1000 V, CAT IV 600 V safety rating
  • Warning function alerts the user that line voltage is present and gives the voltage reading up to 600 V AC or DC for increased user safety
  • Measurements can be stored in up to 99 memory locations, with each location assigned a unique, user defined, label for easy recall

10kV Insulation Testing Product Range

Fluke 1555 FC

Fluke 1555 FC insulation resistance tester or megohmmeter for insulation testing

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:

  • Automatic calculation of Dielectric Absorption (DAR) and Polarization Index (PI) with no additional setup
  • Guard system eliminates the effect of surface leakage current on high-resistance measurements
  • Selectable test voltages in 50 V steps from 250 V to 1000 V, and 100 V steps above 1000 V
  • CAT III 1000 V, CAT IV 600 V safety rating
  • Warning function alerts the user that line voltage is present and gives the voltage reading up to 600 V AC or DC for increased user safety
  • Measurements can be stored in up to 99 memory locations, with each location assigned a unique, user defined, label for easy recall
  • Long battery life gives the user over 750 tests between charges

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