best insulation resistance tester (megohmmeter)

Best Insulation Resistance Tester (Megohmmeter): Top 6 of 2021 Reviewed

Last updated on April 26th, 2021 at 10:35 pm.

Insulation resistance testers (Megohmmeters or “meggers”) are those ohmmeters used to measure the electrical resistance of different insulators. 

Damaged insulation is highly unsafe to both electricians and people nearby – a bad insulation resistance tester may cause much trouble and it is a complete waste of money and time.

On the flip side, a good insulation resistance tester provides accurate readings, has a wide insulation test range, and it is easy to use.

We’ve diligently reviewed some of the best insulation resistance testers & megohmmeters on the market – we’ve found the Top 6 Insulation Resistance Testers of 2021.

Buy with the confidence that you’re getting one of the best insulation resistance testers on the market. Let’s go straight into the reviews.

Preview Product Key Features
Fluke 1507 Digital Megohmmeter Insulation Resistance Tester Fluke 1507 Digital Megohmmeter Insulation Resistance Tester
  • Repetitive or hard-to-reach testing is easy with the remote test probe
  • Live circuit detection prevents insulation test if voltage greater than 30-Volts is detected for added user protection
  • Read measurements easily with large, backlit display
Fluke 1587 Insulation Multimeter, LCD Display, 2 Gigaohms Insulation Resistance, Up to 1000V... Fluke 1587 Insulation Multimeter, LCD Display, 2 Gigaohms Insulation Resistance, Up to 1000V...
  • Manual- and auto-ranging digital insulation multimeter measures insulation resistance, current, voltage, capacitance, frequency, resistance, and temperature, and performs diode tests for testing line insulation on motors, generators, cables, and switch gear
  • True RMS meter provides accurate readings when measuring linear or nonlinear loads where the current or voltage has an undistorted or distorted waveform
  • Insulation test voltages of 50, 100, 250, 500, and 1000V and insulation measurement range of 0.01 megohms to 2 gigohms
Extech 380260 Autoranging Digital Insulation Tester Extech 380260 Autoranging Digital Insulation Tester
  • Measures insulation resistance up to 2000M
  • 250V, 500V and 1000VDC test voltages
  • Measures AC voltage up to 750V and DC voltage up to 1000V
AEMC 2126.53 Digital Megohmmeter, 1000V AEMC 2126.53 Digital Megohmmeter, 1000V
  • True Megohmmeter
  • Insulation test voltage selections of 250V, 500V and 1000V
  • EST LOCK feature for timed measurements up to 15 minutes
Megger MIT230-EN Insulation Tester, 1000 Megaohms Resistance, 250V, 500V, 1000V Test Voltage Megger MIT230-EN Insulation Tester, 1000 Megaohms Resistance, 250V, 500V, 1000V Test Voltage
  • Insulation tester for testing insulation resistance, voltage, and continuity in electrical installations
  • Average-sensing meter provides accurate readings when measuring linear loads, where the current or voltage has a sinusoidal waveform
  • Dual digital display with analog arc function to replicate response of analog meters
Amprobe AMB-25 Digital Insulation Resistance Tester Amprobe AMB-25 Digital Insulation Resistance Tester
  • Insulation resistance meter to test insulation of wires, cables, transformers, and electrical motors
  • Digital meter with automatic range selection
  • Internal memory stores up to 9 test results

Top 6 Best Megohmmeter Insulation Resistance Testers

Fluke 1507 Megohmmeter Insulation Tester

Sale
Fluke 1507 Digital Megohmmeter Insulation Resistance Tester
  • Repetitive or hard-to-reach testing is easy with the remote test probe
  • Live circuit detection prevents insulation test if voltage greater than 30-Volts is detected for added user protection
  • Read measurements easily with large, backlit display

The first insulation tester on our list is the Fluke 1507, one of the best testers available. This tool has it all: a wide variety of features for a great price tag. Fluke tester is capable of testing resistances between 0.01 megaohms to 10 gigaohms. There is also a wide range of test voltages that this model can perform, from 50 V, and increasing incrementally to 100 V, 250 V, 500 V, and 1000 V.

Its display is larger than on other models, thus making it easier to see the readings. Moreover, it’s backlit so it can be used in darkened areas. 

In terms of safety, the Fluke 1507 tester boasts a series of features that makes it easy to use even by beginners. The device won’t let you perform a test if the live circuit detection system sees a voltage higher than 30 V.

Also, the device automatically discharges a capacitive voltage to reduce the possibility of the user being shocked. With a safety rating of Cat IV, this device is perfect for working with higher voltages.

When it comes to design, the Fluke 1507 insulation resistance tester is compact and lightweight. It fits perfectly in any electrician’s toolbox and can be carried out without experiencing any fatigue. 

The Fluke 1507 also features a prolonged 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.

Due to Fluke’s plethora of features and safety measures, we decided to list this tester as our best overall megohmmeter. However, if you’re still not convinced, you can check out our full in-depth Fluke 1507 review.

CHECK PRICE
Advantages
  • Extremely accurate RMS reading
  • Resistance test range up to 10 GΩ
  • Features a remote test probe for difficult testing
  • Backlit display
  • Includes safety measures
Disadvantages
  • Tester misses alligator clips

Fluke 1587 Insulation Tester (2 Gigaohms)

Fluke 1587 Insulation Multimeter, LCD Display, 2 Gigaohms Insulation Resistance, Up to 1000V...
  • Manual- and auto-ranging digital insulation multimeter measures insulation resistance, current, voltage, capacitance, frequency, resistance, and temperature, and performs diode tests for testing line insulation on motors, generators, cables, and switch gear
  • True RMS meter provides accurate readings when measuring linear or nonlinear loads where the current or voltage has an undistorted or distorted waveform
  • Insulation test voltages of 50, 100, 250, 500, and 1000V and insulation measurement range of 0.01 megohms to 2 gigohms

Our premium choice is Fluke 1587 insulation tester, a more expensive alternative to the Fluke 1507. This tester comes with many extra features and it boasts a user-friendly design. Fluke 1587 merges the traits of an insulation tester with those of a multimeter.

Its best overall feature is its auto-ranging – allowing you to 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. Moreover, this model features 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, ensures that you’ll be able to see the results of your tests without having to strain 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 also functions as a True RMS multimeter, which makes it ideal for electricians who want a complete tool while performing their electrical work.

Despite its high-range price tag, Fluke 1587 is the perfect tool for professional electricians who will be frequently conducting insulation and resistance tests. You can read our full in-depth Fluke 1587 review to make an idea of what this tool has to offer.  

CHECK PRICE
Advantages
  • Wonderful build quality
  • Features a low-pass filter that blocks unwanted voltages when reading AC voltage and AC frequency
  • Accurate True RMS meter
  • Auto-discharge of capacitive voltage
  • Certified IP40
Disadvantages
  • Expensive

Extech 380260 Insulation Tester

Sale
Extech 380260 Autoranging Digital Insulation Tester
  • Measures insulation resistance up to 2000M
  • 250V, 500V and 1000VDC test voltages
  • Measures AC voltage up to 750V and DC voltage up to 1000V

Our choice for excellent value is the Extech 380260 insulation tester, a reliable choice for any electrician on a budget. It comes with an amazing build, accurate readings, and ecxtra safety features. The insulation resistance testing ranges from 200 megohms to 2000 megohms.

The voltage range for testing starts at 250 V, 500 V, and goes up to 1000 V. This model also features 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 also has the ability to lock itself on continuous mode, meaning that you don’t have to keep hold of it so that it can do its job. This is useful when you’re working alone, and you need to divert your attention to something else. At the end of every test, the device will automatically discharge as a safety maeasure.

In terms of build, Extech tester features a molded housing that protects the internal components from impacts. It is also one of the lightest insulation resistance testers on the market.

Overall, this is the best choice for an electrician on a budget. The low-price tag brings a plethora of awesome features that should convince you to purchase this device. 

CHECK PRICE
Advantages
  • Provides accurate readings
  • Reliable device
  • Very affordable
  • Includes test leads & a hard carrying case
Disadvantages
  • Fewer features than other models

AEMC Megohmmeter Insulation Resistance Tester

AEMC 2126.53 Digital Megohmmeter, 1000V
  • True Megohmmeter
  • Insulation test voltage selections of 250V, 500V and 1000V
  • EST LOCK feature for timed measurements up to 15 minutes

The next entry on our list is the AEMC megohmmeter, a great option for electricians that are looking for a good but affordable tool. This model is one of the lightest insulation resistance testers in its price range, only weighing 24 ounces.

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. One of its cool features is the included beeper so that you can hear the results if your resistance is under 35 Ω.

The device also features 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. 

CHECK PRICE
Advantages
  • True Megohmmeter
  • Lightweight
  • Dust and water drops proof
  • Affordable
Disadvantages
  • Low-ohm rating
  • Unreliable, requires frequent restarting
  • Fragile housing

Megger MIT230 Insulation Tester (1000 Megaohms)

Megger MIT230-EN Insulation Tester, 1000 Megaohms Resistance, 250V, 500V, 1000V Test Voltage
  • Insulation tester for testing insulation resistance, voltage, and continuity in electrical installations
  • Average-sensing meter provides accurate readings when measuring linear loads, where the current or voltage has a sinusoidal waveform
  • Dual digital display with analog arc function to replicate response of analog meters

Another great insulation tester we’ve reviewed is the Megger MIT230 megger. This is perhaps the best megger tester available due to a series of awesome features that sets it apart. It includes an average sensor means that you can measure linear loads without having to calculate the average readings yourself.

Its compact design makes the Megger tester one of the most portable devices available in its price range. Also, the simple set of controls included ensures that this tester is an excellent choice for beginners also. 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.

Although this is an expensive device, the Megger insulation tester is still the best megger tester available making it the best option for a rich electrician.

CHECK PRICE
Advantages
  • Best insulation tester available
  • IP40 ingress protection
  • Average-sensing meter provides accurate readings for linear loads
  • CAT III rated to 600 V
Disadvantages
  • Expensive device
  • Small screen

Amprobe Insulation Resistance Tester (1000 Megohms)

Sale
Amprobe AMB-25 Digital Insulation Resistance Tester
  • Insulation resistance meter to test insulation of wires, cables, transformers, and electrical motors
  • Digital meter with automatic range selection
  • Internal memory stores up to 9 test results

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

This tester can measure resistance between 0 and 1000 megohms, and it features 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 boasts a CAT III rating of up to 1000 V.

In terms of design, the Amprobe tester features 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, beginner, or professional. 

CHECK PRICE
Advantages
  • Extremely reliable
  • Durable build
  • Internal memory to store test results
  • Cat III rated to 1000 V
Disadvantages
  • More expensive than similar testers
  • Not enough extras

About Thomas Hawkins

I run Electrician Apprentice Headquarters, a one-stop-shop for learning how to become a licensed electrician in the USA. I'm a licensed Master Electrician with over 20 years experience working in the Mining & Construction industries. Why do I do it? Well, because even plumbers need heroes.

Check Also

best swr meter for cb ham radios

Best SWR Meter for CB And HAM Radios: Top 6 of 2021 Reviewed

The best SWR meters have a wideband frequency range, a high ohmic resistance, and are …