The 5 Best Insulation Testers | Megohmmeters [Ranked]
Top5Reviewed is reader-supported. When you buy through links on our site, we may earn an affiliate commission.
Insulation testers (also referred to as Megohmmeters or 'meggers') are a unique type of ohmmeters that are used to evaluate the electrical resistance of insulators.
They are engineered to provide preventative maintenance and troubleshooting solutions for variety of different, high-voltage equipment applications.
These applications include those for cables, switch gears, three-phase motors as well as any testing scenario that doesn't require breaking the circuit.
Our Top Pick: The Fluke Insulation Tester
A quality insulation tester will be equipped to conduct the complete range of test voltages that are outlined in the IEEE 43-2000 and come with a CAT IV 600 V safety rating.
A solid Megohmmeter will be an ideal solution for troubleshooting, helping you to accurately identify and predict potential failures of equipment before they actually break down.
The Fluke Video Overview
Let's take a deeper look at 5 of the top-selling insulation testers.
- Our Top Pick: The Fluke Insulation Tester
- Comparing Them
- Another Favorite
- What Can You Expect When You Purchase A Megohmmeter?
- Summing Up
|Insulation Testers||Price||Our Rating||Weight|
|The Reed Insulation Tester and Multimeter||$$||4.2||1.1 lb|
|The Supco Insulation Tester & Electronic Megohmmeter||$||4.7||1 lb|
|The Fluke Digital Megohmmeter & Insulation Resistance Tester||$$$||4.9||2.2 lbs|
|The Extech Autoranging Digital Insulation Tester||$$||4.0||2.2 lbs|
|The Amprobe Insulation Resistance Tester||$||4.3||1 lb|
The 1 lb Supco M500 Insulation Tester and Electronic Megohmmeter is an inexpensive and handheld alternative to more expensive swing needle megohmmeters. It is equipped to provide insulation measurement values all the way up to 1000 megohms at 500 VAC.
One user who works in commercial and industrial A/C installations, frequently meggs out motors and reports that the Supco is pretty accurate, though he does not advise that it be used for stuff bigger than 25 hp. He writes that it is exceptional for blower motors, small compressors etc., as well as for testing wiring in cases of what he calls intermittent electrical issues.
Another consumer writes that you either are going to choose the Supco or the much more robust Fluke insulation tester. He also says he has used it primarily to get a sense of whether small motors have bad windings.
An appliance repairman writes that he loves the Supco because it is exactly what he needs to do appliance repairs on washing machines, dryers, refrigerators and residential freezers. Additionally, he loves that he can refer to the digital display screen to demonstrate to his customers that a motor is failing or has failed- making him look much more professional.
This is definitely the best value insulation tester for the money on the market today.
How To Use The Supco M500 Insulation Tester
- An inexpensive alternative to more pricey insulation testers
- LED display makes it easy to use
- Some users say that the leads are too short
- Not ideal for using on items greater than 25hp
What Can You Expect When You Purchase A Megohmmeter?
- You usually receive a current clamp,
- a rotation indicator,
- a thermocouple,
- a remote probe,
- different types of test leads,
- AA batteries,
- a carrying case,
- and instructions.
- An insulation resistance tester is a type of electrical testing meter that is able to sense various properties of electrical circuits.
- These Megohmmeters can assess resistance, capacitance, continuity as well as current.
- Generally, they are available in a handheld or benchtop format, and come completely equipped to assess different sorts of equipment as well as power supplies.
- Generally they will ship with a bunch of different clamps, probes as well as leads that are used to make a connection between the meter and the circuit.
- For the most part, Megohmmeters will be safety certified based on the International Electrotechnical Commission standards for testing equipment that is of low - voltage.
- The IEC 61010 actually distinguishes between different over-voltage types of installation categories.
- Generally you will find that the Megohmmeters with a category 4 rating will offer you the best protection against transient voltages as compared to meters that possess lower ratings on this category scale.
If you are looking to purchase an insulation tester and Megohmmeter, check out our comparison table above. We've also assembled some useful video content for you to examine prior to making an investment in a high-quality insulation resistance tester.