Best Insulation Resistance Tester (Megohmmeter): Top 6 of 2026 Reviewed

Last updated on October 22nd, 2026.

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Insulation resistance testers (Megohmmeters or “meggers”) measure the electrical resistance of insulators. 

Damaged insulation endangers electricians and people nearby. A faulty insulation resistance tester can create problems while wasting time and money.

A good insulation resistance tester gives accurate readings across a wide test range and is easy to use.

We reviewed insulation resistance testers & megohmmeters to choose the Top 6 Insulation Resistance Testers of 2026.

Compare our insulation resistance tester picks in the reviews below.

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Top 6 Best Megohmmeter Insulation Resistance Testers

Fluke 1507 Megohmmeter Insulation Tester

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The Fluke 1507 is our top insulation tester pick for its price and test range of 0.01 megaohms to 10 gigaohms. Test voltages run in increments from 50 V to 1000 V for different electrical applications.

Its larger display makes readings easier to see than on other models. The backlight lets you use it in darkened areas. 

The Fluke 1507 has safety features that make it easy for beginners to use. The device won’t let you perform a test if the live circuit detection system sees a voltage higher than 30 V.

The device automatically discharges a capacitive voltage to reduce the possibility of the user being shocked. Its Cat IV safety rating suits work with higher voltages.

The compact, lightweight Fluke 1507 fits in an electrician’s toolbox and is easy to carry without fatigue. 

The Fluke 1507 also has longer battery life than other models in its price range. Using a new set of cells, it should be able to conduct about 1000 insulation tests before they need replacing. The package also includes four AA batteries.

We chose this tester as our best overall megohmmeter for its features and safety measures. Read our full in-depth Fluke 1507 review for more detail.

Fluke 1587 Insulation Tester (2 Gigaohms)

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The Fluke 1587 is our premium pick, combining insulation testing with a full multimeter. It costs more than the Fluke 1507, but its additional functions and user-focused design justify that price.

Its auto-ranging lets you measure insulation resistance, current, voltage, capacitance, frequency, resistance and temperature. Fluke 1587 also performs diode tests for testing line insulation on motors, generators, cables and switchgear.

The range of insulation test voltages varies from a minimum of 50 V up to a maximum of 1000 V. Its insulation measurement range is between 0.01 Megohms to 2 Gigohms. This model has a CAT III safety rating up to 1000 V and a CAT IV rating up to 600 V.

This Fluke model won’t allow you to conduct a test if it detects a voltage higher than 30 V. Its large, backlit display lets you see test results without straining your eyes.

Being also an authentic True RMS digital multimeter, Fluke 1587 takes accurate readings when measuring linear or nonlinear loads where the current or voltage has an undistorted or distorted waveform.

The battery lifespan is longer than expected due to the tester’s capability to automatically shut down after 20 minutes of inactivity. Fluke also included a low-battery indicator that will show you when you have to replace the batteries. 

Altogether, the Fluke 1587 device is the highest-quality and most versatile insulation tester available. It is also a True RMS multimeter, which makes it ideal for electricians who want a complete tool while performing their electrical work.

Despite its high price, we recommend the Fluke 1587 for professional electricians who frequently conduct insulation and resistance tests. Our full in-depth Fluke 1587 review explains its functions.  

Extech 380260 Insulation Tester

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The Extech 380260 is our value pick for electricians on a budget. It combines accuracy and safety with durable construction, testing insulation resistance from 200 megohms to 2000 megohms at an affordable price.

The voltage range for testing starts at 250 V and 500 V, and goes up to 1000 V. This model also has a backlit display with large readings so that you can use the device in dark spaces. The dual backlit display shows both the test voltage and insulation resistance.

With a basic accuracy level of +/- 3%, Extech is one of the most accurate models in its price range, and it doesn’t return any striking errors when used. Despite its low price tag, it also comes included with everything that an electrician needs to get started – 6 AA batteries, multimeter test leads, alligator clips and a carry case.

The device can lock into continuous mode so you do not have to keep holding it during testing. This is useful when you work alone and need to turn your attention elsewhere. It automatically discharges at the end of every test as a safety measure.

The Extech tester has molded housing to protect its internal components from impacts. It is also one of the lightest insulation resistance testers on the market.

We recommend the Extech for electricians on a budget because it includes these functions at a low price. 

AEMC Megohmmeter Insulation Resistance Tester

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The AEMC megohmmeter is a reasonably priced option for electricians. It is also one of the lightest models available, making it convenient to carry while providing the performance you need.

You can perform three insulation test voltages: 250 V, 500 V and 1000 V. As for resistance, the AEMC tester can measure between 1 kΩ and 4000 MΩ. The included beeper lets you hear the results if your resistance is under 35 Ω.

The device also has overload protection rated at 600 Vrms. In case you are conducting extended testing, you can lock the test button for up to 15 minutes. 

Its backlit digital display allows you to work with this insulation resistance tester in the darkened spaces, and it has a rating of IP51 so that it can resist dust and drops of water. AEMC tester has a longer battery lifespan than its competitors, though it uses six AA batteries. 

Although this insulation resistance tester is not as reliable as other models, it is still a good choice if you are on a budget and you are an AEMC fan. 

Megger MIT230 Insulation Tester (1000 Megaohms)

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The Megger MIT230 is arguably our best megger pick. Its average-sensing meter gives accurate linear-load readings without manual calculations.

The compact Megger tester is one of the most portable devices in its price range. Its simple controls also make it an excellent choice for beginners. CAT III rated up to 600 V and IP40 rated, this tester is safe to use and it is quite difficult to break it.  

A drawback of this model is its digital display screen that is smaller, making it difficult to read if you are not sharp-eyed. But the tester includes an analog-style meter so that users of both types of insulation testers can be comfortable with it. 

This model can measure insulation resistance from 0 to 1000 megohms, and it can read voltages ranging from 25 V to 600 V.

The Megger insulation tester is expensive, but we still consider it the best megger tester available for electricians who can afford it.

Amprobe Insulation Resistance Tester (1000 Megohms)

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Our last entry on the best megohmmeters list is the Amprobe insulation resistance tester, an affordable option. 

This tester can measure resistance between 0 and 1000 megohms, and it has DC test voltages of 250 V, 500 V and 1000 V. It is also one of the safest budget resistance testers on the market, as it has a CAT III rating of up to 1000 V.

The Amprobe tester has rugged housing that makes it one of the most durable devices on the market. This tester, with a built-in voltmeter, allows you to test the insulation of wires, cables or electrical motors. 

Its internal memory allows you to save up to 4,000 test results and download them to your PC, for future reference. Unlike many of its competitors, the Amprobe resistance tester is also extremely reliable, as these devices are known to keep working correctly for years.

Despite the fact that the Amprobe tester is more expensive than the Extech model, it does not feature many extras. However, it still makes a great choice for any electrician, whether a beginner or professional.