Digital Megger: Four Insulation Testers Compared
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A digital megger, also called a digital insulation resistance tester or megohmmeter, applies a set test voltage to a cable, winding or component and reads how well the insulation holds back that voltage. The four testers below are the ones whose listings state a test voltage and a resistance range. The figures were checked on 11 October 2026 and are shown as the sellers state them, with no independent check added.
Quick answer: if you want one tester that covers several test voltages, look at the Megger MIT310-EN, the SKYCENX VC60B or the JUNLIXN VC60B+, since each lists 250 V, 500 V and 1000 V. If you want a single 500 V setting with an analog scale, the ToolSentryX M500 is the one to compare.
The four testers at a glance
| Tester | Listed test voltage | Listed resistance range | Power (as listed) |
|---|---|---|---|
| Megger MIT310-EN (B008838W4M) | 250, 500 and 1000 V | Style name reads 1000 Megaohms Resistance | Battery powered |
| ToolSentryX M500 (B0G31Z1M1V) | 500 V | Up to 1000 MΩ | Battery powered |
| SKYCENX VC60B (B003O4PUHC) | 250, 500 and 1000 V | 0.1 MΩ to 2 GΩ | Battery powered |
| JUNLIXN VC60B+ (B0CWPBZM9K) | 250, 500 and 1000 V | Up to 2000 MΩ | Six 1.5 V AA batteries or external 9 V DC |
How we chose these four
We kept a tester when its listing states a test voltage, a resistance range and an insulation use. The four pass those checks. The pool also held a Yachuang MS2302 earth ground resistance tester, which we left out because its listing describes earth ground resistance, not insulation resistance. Every fact below comes from the listing data alone.
- Test voltage: each pick names the voltage it applies, either as three steps or as one fixed 500 V output.
- Range: each pick states the top of its resistance range, in megaohms or gigaohms.
- Use: the listing names insulation work, not a general multimeter use.
1. Megger MIT310-EN Digital/Analog Insulation Tester
The listing gives test voltages of 250, 500 and 1000 V and describes a digital and analog display. It is battery powered, weighs 2.2 pounds and measures 4.25 by 11 by 12 inches. The bullets state a live circuit warning, weatherproofing to IP54 and a three-year warranty, and they describe a tough rubber armoured case and a calibration certificate. The Specification Met field lists IEC 61326 and IEC 61010-1.
Check the Megger MIT310-EN on Amazon
2. ToolSentryX M500 Megohmmeter Insulation Tester
The listing describes a stable 500 V output and insulation resistance readings up to 1000 MΩ. Its analog scale is divided into Good, Caution and Bad zones. The housing is a double-layer ABS enclosure, and the listing includes a soft carrying pouch. The listing names compressors, motor windings, transformers, panels and control circuits as uses. It is battery powered, and the listing gives no weight or dimensions. The listing also claims that the tester detects insulation breakdown and moisture problems. That is the seller’s claim, and the listing gives no figure to support it.
Check the ToolSentryX M500 on Amazon
3. SKYCENX VC60B Digital Insulation Resistance Tester
The title gives a range of 0.1 MΩ to 2 GΩ and offers 250 V, 500 V and 1000 V DC test voltages. The bullets add AC voltage measurement up to 750 V at ±1.0% accuracy, 1999 counts, a 3.5-inch backlit LCD and a buzzer for high voltage and short circuit. The listing says the meter samples about three times per second and has a data hold. The item weight is 2.5 kg, which is about 5.5 pounds, and the dimensions are 7.28 by 4.53 by 2.56 inches. The Specification Met field lists CE and RoHS.
Check the SKYCENX VC60B on Amazon
4. JUNLIXN VC60B+ Digital Insulation Resistance Tester
The listing gives the same 250, 500 and 1000 V test voltages and says insulation readings go up to 2000 MΩ. It adds a continuity function that checks for open and short circuits, automatic range selection and a 3.5-inch backlit LCD. The tester has a protective cover with a 72 cm adjustable shoulder strap. The power field reads six 1.5 V AA batteries or an external 9 V DC supply. The dimensions are 6.93 by 4.57 by 2.48 inches, and the Specification Met field lists CE, RoHS and UL.
Check the JUNLIXN VC60B+ on Amazon
The two VC60B models use different units for the same top figure. The SKYCENX title says 2 GΩ and the JUNLIXN bullet says 2000 MΩ. Those are the same value, since 1 GΩ equals 1000 MΩ. The listings do not state whether the two meters share a circuit design, so treat them as separate products.
Worked example: does the test voltage fit the job?
Take the ToolSentryX M500. Its listing gives a 500 V output and a top reading of 1000 MΩ. Suppose a motor winding reads 250 MΩ on it. That reading is a quarter of the top of the scale. The listing does not say what minimum reading a winding must reach, so the acceptable figure has to come from the equipment’s own manual. The M500 has no 1000 V setting in its listing, so a job that calls for a 1000 V test needs one of the other three.
What the listings do not say
- None of the four listings gives an independent accuracy test. The accuracy figures are the sellers’ statements.
- The M500 listing names Good, Caution and Bad zones on its scale but does not give the megohm value at each zone edge.
- Only the MIT310-EN listing mentions a calibration certificate. The other three do not say how they are calibrated.
- The VC60B+ continuity function is a listing claim. The listing does not give the continuity resistance threshold.
Frequently asked questions
What does a digital megger measure?
According to the listings, these testers apply a set DC test voltage and read insulation resistance in megaohms or gigaohms. Three of the four list 250 V, 500 V and 1000 V, and the ToolSentryX M500 lists a single 500 V output.
How do I choose the test voltage?
None of the listings gives a selection rule. Match the test voltage to the value the equipment manual calls for, and treat the listing as a description of the tester only.
Is 2 GΩ the same as 2000 MΩ?
Yes. Two gigaohms equals 2000 megaohms. The SKYCENX VC60B lists its top range as 2 GΩ, and the JUNLIXN VC60B+ lists 2000 MΩ.
Can these testers also read voltage?
The Megger MIT310-EN lists voltmeter as a measurement type. The SKYCENX VC60B lists AC voltage up to 750 V. The JUNLIXN VC60B+ bullets list DC and AC voltage measurement. The ToolSentryX M500 listing does not mention a voltage mode.
Does the M500 have a continuity mode?
The M500 listing does not mention continuity. Its bullets cover insulation testing, the analog scale and the carrying pouch only.
Conclusion
For one tester with three test voltages, the Megger MIT310-EN, the SKYCENX VC60B and the JUNLIXN VC60B+ fit the listing data. For a single 500 V setting with an analog scale, the ToolSentryX M500 is the option to compare. Check the test voltage and the top of the range against the equipment documentation before you buy.
For more on the category, see best megger tester, best megohmmeter tester and insulation resistance test equipment.
Megger MIT310-EN on Amazon · ToolSentryX M500 on Amazon · SKYCENX VC60B on Amazon · JUNLIXN VC60B+ on Amazon
