M500 Megohmmeter for Insulation Testing，Compatible with Supco M500 Electronic Megohmmeter,Works for Motors,HVAC Systems Tools, Compressor Tester,1000 Megohms at 500 Volts
Original price was: $84.99.$74.99Current price is: $74.99.
Price: $84.99 - $74.99
(as of Oct 09, 2025 08:10:46 UTC – Details)
Product description
M500 Insulation Tester/Electronic Megohmmeter
The M500 is an economical and practical portable digital insulation resistance tester (LED indicators megohmmeter) for testing the insulation of electrical equipment, motors, cables, transformers and more. Using 2 C size batteries (not included) , it accurately measures insulation values up to 1000 megohms at 500 volts and displays insulation conditions on an area scale.Soft carrying case and operating manual included.
Product Dimensions : 1 x 6 x 6.9 inches; 11.36 ounces
Item model number : M500
Date First Available : June 14, 2025
Manufacturer : OIUEBXE
ASIN : B0FD6BJ2DQ
Best Sellers Rank: #39,206 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #5 in Insulation Resistance Meters
Customer Reviews: 4.5 4.5 out of 5 stars 19 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Indicator Range:20 To 1000 megohms
Applied Voltage:500 Volts
Power Source:”c” Size Batteries (not included)
Back Panel：Removable For Test Lead Storage（6‘’ Long test leads）
Soft carrying case and operating manual included
m500 megohmmeter
8 reviews for M500 Megohmmeter for Insulation Testing，Compatible with Supco M500 Electronic Megohmmeter,Works for Motors,HVAC Systems Tools, Compressor Tester,1000 Megohms at 500 Volts
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Original price was: $84.99.$74.99Current price is: $74.99.
Mike manuel –
Nothing
So far I love it
Mitchell Brown –
Great tool
Works great. Fantastic tool to gauge expected lifespan of compressors.
Paige W. –
Good for what it needs to be used for
Got for my dad for his work. Says it works great for what he needs. Only downfall is he doesnât like the compartment that the cords are stored in as the door is weird so you have to keep shoving cord down to close the door on the compartment.
Amazon Customer –
Works great
Works great
A B –
I finally got one
This is one of those tools that I donât need to use but once in a blue moon, but I have always wanted on. This Supco-M500 Megohmmeter can test really high resistances and help determine if a motor or other insulated electrical circuit has found a path to ground. I did a quick test on a drill press. I connected the positive lead to on leg of the ac input. I then tested the meter to the metal chassis. All good.I wanted to see if I could make the meter show some resistance, so I left the ground connected to the chassis and held the other probe (maybe not the best idea). I then touched the chassis, and saw the reading go up. I also just tested with holding the two leads, one in each hand. I failed the insulation test because my body only has a few megaohms of resistance.One thing I really liked about the meter is the magnetic clips. If the terminal or hardware is ferromagnetic, you can just stick the clip on with the magnet. Saves some time and the hassle of clipping to the terminal or having to find a larger clip lead and connecting to that.There are two things about the meter I donât like, but they are minor. One is that the back cover is difficult to install. It has to be lined up, just right. Since you store the probes in the back cover, that can be annoying. The second thing that was slightly annoying was that this thing needs C cell batteries (not included). It is only one of about three things in my entire house that needs that size. The seller tells you this upfront so it should not be a surprise. Other than those two very small issues, I think this thing is great, and I am very happy to now have a megaohm meter in my tool kit.From my testing, this unit appears accurate, but that is not a lab quality test. Even the manual indicates it can provide false readings if there is moisture or dirt present. The unit is functional, relatively small, and for what you get, a good value.
Soapy Toupee –
Simple to use and gives immediate results
I’ve been wanting a megohmmeter for some time now and I finally pulled the trigger. I use it to test for insulation breakdown in vintage transformers and power supply inductors. Sometimes these devices were not stored under ideal climate controlled conditions and testing with this instrument gives me peace of mind that there isn’t a problem lurking due to moisture incursion or other factors. This can be an issue for early open frame construction units that weren’t varnish dipped at the factory.Making the test is simply applying the two alligator clips and pressing the button. No muss, no fuss.
Johnathan –
Accurate and Compact Megohmmeter That Gets the Job Done
I received the M500 Megohmmeter for insulation testing and have been impressed with its performance. I tested it on a motor I already knew was faulty, and it correctly identified the issue, which gave me immediate confidence in its accuracy. It measures insulation resistance up to 1000 megohms at 500 volts, just as advertised.One thing to keep in mind: it requires two C-sized batteries, which are not included, so be sure to have those on hand. A feature I really appreciate is that the leads store neatly inside the battery compartmentâa smart design that makes it easy to keep everything together.The included pouch is also a nice bonus. Itâs sturdy, compact, and keeps the device protected and portable. If you’re looking for a reliable megohmmeter for basic insulation checks, this one works great.
TECHnical –
Easy to read and seems accurate. Magnetic alligator clips. Seems actually 1050V.
I’m using this megohm meter to test various AC-connected devices and wiring. I’ve tested many chargers and wall transformers for leakage from AC to DC (initially they show a little as their Y capacitor charges). It gives some peace of mind testing AC wiring (disconnected) and other high-voltage systems for any deteriorating insulation. I’ve tested some fans for the same, as motor winding varnish can deteriorate and connect with the frame. Alligator clips have magnets in them so they will stick to many metal leads, handy for quick connection. LED readout is clear and bright. It seems accurate, reading around 150 Mohm where an LCR meter read the same. Unit is sturdy and a decent size. Leads conveniently store in back when not in use. Instructions describe how to test motor windings. This is a decent value.Measured voltage seems to be 1050V. I used a 11:1 resistive divider (10M and 1M resistors) and measured 96V across the 1M. With 96V across 1M, current is only about 0.094 mA, very low. I accidentally touched the leads a few times and it isn’t pleasant.Battery selection is limited. I didn’t want to stock C disposable batteries since I don’t use them for anything else, so I tried some AA-to-C adapters on rechargeable batteries. NiMH seemed to underpower it, due to the lower voltage. I ended up using a 3.2V LiFePO4 battery and a spacer battery in combination, and it works well. Current draw is about 830 mA when operating.Minor issues:- No way to switch on without having to hold button, which makes it difficult to use both hands to place test leads.- Clip lead end covers slide off easily when operating them.- Wires come out underside, making it rest uneven on a surface. I cut a small section out of battery door so they come out near front, much nicer.