Best Megohmmeter Tester: Specs and Fit Compared
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A megohmmeter tester measures insulation resistance, so the two numbers that matter most are the test voltage and the resistance range. Only some of the six listings below state them in the title. This guide sorts them by what each listing actually says, and it marks every missing figure as not stated.
Insulation testing can apply high voltage and leave a charge behind. Isolate the equipment, discharge it before and after each test, follow the maker’s manual, and leave panel work to a licensed electrician.
Quick answer
If you need a stated range in the title, look at the Supco M500 (0 to 1000 megohms), the YUKGAMS M500 (1000 megohms, titled as compatible with the Supco), the AIOMEST VC60B (1000V) and the Ayitam (50V-1000V, up to 100GΩ). The Klein Tools ET600 and the Precalixor combine an insulation tester with a multimeter, but their titles quote no test voltage or range, so confirm both on the product page first.
Comparison table
| Product | What the title says | Range or voltage in title | Power source | Style |
|---|---|---|---|---|
| Klein Tools ET600 | Megohmmeter, insulation tester and multimeter | Not stated | Battery Powered | Tester |
| Supco M500 | Electronic megohmmeter | 0 to 1000 megohms | Battery Powered | Electronic |
| Precalixor 2-in-1 | Digital multimeter and insulation resistance tester, TRMS | Not stated | Battery Powered, electric | Handheld |
| YUKGAMS M500 | M500 megohmmeter, compatible with Supco, for HVAC testing | 1000 megohms | Battery Powered | M500 Megohmmeter |
| AIOMEST VC60B | 1000V megaohm meter, insulation resistance tester | 1000V | Battery Powered | Modern |
| Ayitam | Megohmmeter, insulation resistance tester | 50V-1000V, up to 100GΩ | Battery Powered | compact |
Specs were checked on 2026-10-11. Weight and size are not stated for any of the six.
The six testers in detail
Klein Tools ET600 Megohmmeter Insulation Tester Multimeter
What it is: A battery-powered tester that the title describes as a megohmmeter, insulation tester and multimeter in one. The color is Orange/Black.
Who it suits: Someone who wants insulation testing and multimeter functions in one instrument, once the test voltage is confirmed.
- Pros: Combines insulation testing with multimeter functions in a single listing.
- Cons: The title and card give no test voltage and no resistance range.
Skip if: Your equipment needs a specific test voltage and the product page does not state it.
Klein Tools ET600 on Amazon (affiliate link)
Supco M500 Electronic Megohmmeter
What it is: An electronic megohmmeter whose title gives a 0 to 1000 megohm range. It is battery powered and the color is Black.
Who it suits: Someone whose equipment falls inside 0 to 1000 megohms and who will check the test voltage on the product page, because the title does not give one.
- Pros: The resistance range is stated plainly in the title.
- Cons: No test voltage is quoted.
Skip if: You need readings above 1000 megohms.
Supco M500 on Amazon (affiliate link)
Precalixor 2-in-1 Digital Multimeter and Insulation Resistance Tester
What it is: A handheld unit sold as a TRMS digital multimeter and insulation resistance tester. Power source is listed as Battery Powered, electric, and the color is Orange.
Who it suits: Someone who wants a handheld combination of multimeter and insulation tester and will confirm the ranges first.
- Pros: Two instruments in one handheld body.
- Cons: No test voltage or resistance range appears on the card.
Skip if: You need the range stated before you order.
Precalixor tester on Amazon (affiliate link)
YUKGAMS M500 Megohmmeter
What it is: A battery-powered M500 megohmmeter. The title says it is compatible with Supco, with 1000 megohms for HVAC testing. The color is gray.
Who it suits: Someone who specifically wants the M500 format at 1000 megohms and will confirm what the listing includes and what it is compatible with.
- Pros: The 1000 megohm figure and the HVAC use are both in the title.
- Cons: The wording compatible with Supco leaves open exactly what is being sold, so check the product page.
Skip if: You want a clearly branded original rather than a compatible unit.
YUKGAMS M500 on Amazon (affiliate link)
AIOMEST VC60B Megohmmeter
What it is: A 1000V megaohm meter and insulation resistance tester, model VC60B. It is battery powered, style Modern, color orange.
Who it suits: Someone who wants a 1000V test voltage and will confirm the resistance range on the product page.
- Pros: The 1000V test voltage is in the title.
- Cons: No resistance range is quoted.
Skip if: Your equipment needs a lower test voltage than 1000V.
AIOMEST VC60B on Amazon (affiliate link)
Ayitam Megohmmeter, 50V-1000V, up to 100GΩ
What it is: A compact, battery-powered insulation resistance tester. The title gives a 50V-1000V test range and resistance up to 100GΩ. The color is orange and black.
Who it suits: Someone whose equipment needs test voltages anywhere from 50V to 1000V, or resistance readings up to 100GΩ.
- Pros: The only listing here that states both a voltage span and a resistance ceiling.
- Cons: Dimensions and weight are not stated.
Skip if: Size matters and you cannot confirm it on the product page.
Ayitam megohmmeter on Amazon (affiliate link)
Buying checklist
- Write down the test voltage and resistance range your equipment needs.
- Drop any listing whose range or test voltage does not cover that need. Four titles state one: Supco, YUKGAMS, AIOMEST and Ayitam.
- For the two that state neither (Klein Tools and Precalixor), find both figures on the product page before ordering.
- Check the exact variant on the product page, since another variant can change the details quoted here.
- Confirm that test leads and batteries are included, because this guide does not state included parts.
- Read the maker’s safety directions before the first test.
Related guides on this site: Fluke 1507 digital megohmmeter guide, insulation resistance tester guide and Fluke 1507 insulation tester guide.
FAQ
What does a megohmmeter tester measure?
It measures insulation resistance, the resistance between conductors and their surroundings. The titles here describe it as a megohmmeter or insulation resistance tester.
Which listing states the widest range?
The Ayitam title states a 50V-1000V test range and up to 100GΩ. The Supco and YUKGAMS titles state 0 to 1000 megohms and 1000 megohms, and the AIOMEST title states 1000V.
Do the Klein Tools ET600 and Precalixor state a test voltage?
No. Neither title nor card quotes a test voltage or resistance range, so check the product page before relying on either.
What does compatible with Supco mean on the YUKGAMS listing?
The title says the M500 is compatible with Supco. This guide does not state what it is compatible with, so read the product page to confirm what is sold.
Is it safe to test insulation without discharging the equipment?
No. Insulation testing can leave a charge behind, so isolate the equipment and discharge it before and after each test, and follow the maker’s manual.
Closing note
For a megohmmeter tester, pick on the figures a listing states rather than on a brand name. Four of the six give a range or voltage in the title, and the other two need that check on the product page. Whichever you choose, treat the safety steps as part of the job.
