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Description
MAJ MT550Digital Insulation Testers 250V 500V 1000V Voltage Ranges Insulation Tester Overview The MT550 is a 1000V Digital Insulation Tester easy to use handheld meter and has three test voltage ranges 250V, 500V and 1000V together with two continuity ranges. Whilst doing the insulation test, the large LCD will indicate the insulation resistance together with the actual output voltage. Once the test is complete the circuit under test will be automatically
Digital Insulation Testers • 250V-500V-1000V Voltage Ranges
Insulation Tester
Overview
The MT550 is a 1000V Digital Insulation Tester easy-to-use handheld meter and has three test voltage ranges 250V, 500V and 1000V together with two continuity ranges. Whilst doing the insulation test, the large LCD will indicate the insulation resistance together with the actual output voltage. Once the test is complete the circuit under test will be automatically discharged. The MT550 features an AC and DC voltage ranges, battery voltage indication, resistance and a continuity buzzer. If AC voltage is detected, the LCD will display the actual voltage to the user except in the off position.
Features
- Three test ranges 250V-500V-1000V
- 750V AC voltage and 1000V DC voltage ranges
- Live Circuit warning and buzzer
- Data Hold function
- 1mA output current on insulation test
- 200mA short circuit on continuity range
- Continuity Buzzer
- Automatic discharge after test
- Lock down Test Button for continuous use
- Hands free strap and magnet supplied as standard accessories
- Rubber overmould housing
- Illuminated display
Accessories:
- Test Leads
- Black Crock Lead
- Magnetic Strip
- Carrying Case
- Adjustable shoulder strap
- 6 x AA Batteries
- Instruction Manual
Specifications
| DC Voltage |
0 – 1000V |
|---|---|
| DC Voltage resolution |
1V |
| DC Voltage accuracy |
±(0.8% +3) |
| AC Voltage |
0 – 750V |
| AC Voltage resolution |
1V |
| AC voltage accuracy |
±(1.2%+10) |
| Resistance |
200Ω – 200KΩ |
| Resistance resolution |
0.1Ω |
| Resistance accuracy |
±(1% + 2 Digits) |
| Insulation resistance 250V |
250V |
| Insulation resolution 250V |
0 – 200MΩ |
| Insulation accuracy 250V |
±(3.0% +5) |
| Insulation resistance 500V |
500V |
| Insulation resolution 500V |
0 – 200MΩ |
| Insulation accuracy 500V |
±(3.0% +5) |
| Insulation resistance 1000V |
1000V |
| Insulation resolution 1000V |
0 – 2000MΩ |
| Insulation accuracy 1000V |
±(5.0% +5) |
| Short Circuit Current |
1.0mA |
| Over-range indication |
Yes |
| AC Bandwidth |
40Hz – 400Hz |
| Digital Display |
Dual LCD Display |
| Continuity |
Yes |
| Auto discharge |
Yes |
| Input Impedance |
˃10MΩ VDC & ˃10MΩ VAC |
| Data Hold |
Yes |
| Back Light |
Yes |
| Enclosure |
Double moulded |
| Low battery indication |
Yes |
| Power Supply |
6 x AA |
| Weight |
700g |
| Dimensions |
200 x 92 x 50mm |
| Safety Specs |
IEC61010-1 CAT IV 600V |
Downloads
Additional Information
| Keywords | major tech, MT550, insulation tester, insulation, tester, digital |
| Device | Insulation Tester |
| Type | Digital |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 30 reviews
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Product Reviews
★★★★★ 4
My puppy loves this!!!
UPDATE: my puppy still loves this toy, but I’m not super impressed with the craftsmanship. The fabric around the Velcro started to fray after just a few days and within a week the Velcro was completely detached from the fabric. She’s still able to play with it for now though. I’ll probably end up taking the ball out of the inside and putting it into a different toy and I’ll just sew some Velcro on so I can open and close it. It does stay charged a long time and my puppy enjoys playing with it but the novelty wears off a lot quicker now that she’s had it a couple of weeks. She’s usually into it for about 5 min and then it just vibrates its way into a corner until I turn it off.
My 4 month old chorkie (6 pounds) absolutely loves this toy! I was afraid it might scare her at first but no, as soon as we turned it on she was like “LET ME AT IT!!” We’ve only had a it a few days but so far, it’s been a godsend when we are eating dinner or working or other times when we can’t entertain her as much as we would like to. It wears her out too, and after playing with it for about 20 minutes, it’s nap time. So far the battery life has been great. I fully charged it when it arrived and 3 days later it still hasn’t needed to be charged, and she has played with it for about an hour a day, in 15-20 min increments. I like that it has Velcro instead of a zipper, I think it’s a lot safer. The initial “Hello” when you turn it on is kind of loud but other than that, the noises it makes aren’t super loud. It repeats back the things you say, which took me a while to figure out. My puppy hasn’t barked at it but if you have a barker just keep that in mind, it will basically double the barks. It feels like it’s made pretty well, and my dog is kind of an aggressive chewer (she’s a teething puppy so of course she is) but so far it’s held up really well and she hasn’t been able to get the Velcro undone and get to the ball in the middle but if you have a bigger dog they might be able to. The Velcro is pretty strong though. Overall, it’s super cute and it makes my puppy happy which makes me happy! I definitely recommend to anyone who has a puppy or a dog with a lot of energy and needs something to keep them occupied for a while. I will say, after about 30 minutes max, my puppy is kind of over it but that’s a lot longer than anything else has kept her attention so I consider that a win. If I remember, I will update after a month or so to say how it’s holding up as far as charging goes and the overall quality of the toy, but so far I’m super impressed.
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Reviewed in the United States on February 1, 2026
★★★★★ 2
Major flaw
My dog liked this, but the charging port part is at the perfect position for dog teeth to catch on (there's a very large indented part with the on/off switch and that), so after only about two weeks of play, the usb C port is ruined and the toy can no longer be charged.
Larger dogs or very small dogs might have fewer issues. My dog is a miniature dachshund and he could pick up the toy by biting at that indented part.
(Also that "hello" is incredibly grating and if I forgot to turn off the toy would sound hours later, like in the middle of the night when we're sleeping and then my dog wakes up and freaks out.)
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Reviewed in the United States on January 18, 2026
★★★★★ 5
Foxy
Oh my! My grand pup loves his and so do my pups had to order #3
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Really cool cat toy for even the most picky cat!
Color: A1-Red, Color: A1-Red
I love it, wow. Our cat is picky with toys, but even he was intrigued by it. It really kept his attention, which is hard to do. It comes with three modes: fast, slow, and interactive. The only thing is that hair can get all trapped up in it because it's a wheel, so keep your house clean I guess lol. The tail also came off once, so you gotta snuggly get it on up there. Really cool cat toy though, I'm happy I got it lol
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Reviewed in the United States on February 23, 2026
★★★★★ 1
Not worth the money
Color: A1-Red
My small Chihuahua loved this toy. It kept him entertained until it would stop working. He only gets about 10 minutes of play and it's no longer charged to use. I even bought a second one thinking the first one might have been just bad luck, but nope, the same problem. It seems most of these interactive toys are only given 2 to 3 stars. I'm disappointed but more importantly, my pup is even more.
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Reviewed in the United States on March 24, 2026