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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
4.0 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Different colors
Style: EcoFetch
Works well. It is nice it is a different color from all the other Chuckit it balls. Dog loves it. Just wish she would bring it back.
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Reviewed in the United States on May 6, 2026
★★★★★ 4
Value for your money
Style: EcoFetch
It's definitely different from the one I lost. It's taking me some time how to throw the ball correctly. It's a hit and miss but we are getting there. When I do get a good throw, it really wings it out there.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Well worth it
Style: EcoFetch
Works great
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Awesome quality balls -- my dog loves them!
Color: F) 3-Pack (2.5" Balls)
Love this 3 ball set and variety and quality. These are the 2.5" size, similar to a tennis ball size give or take. The fun citron yellow one is the thickest + heaviest, very bouncy, and tough. The blue is still tough but not as thick or bouncy, a bit more flexible. And the clearish one is the lightest/flexible and is glow in the dark [although we haven't tried that part yet]. I have a 7month old 40lb girl who is becoming like a power chewer on some things -- but hasn't done that with these. She can play, mouth them, chew them, not even one knick or anything. Yes! The citron and blue one we leave out all the time in her little toy box. They have holes in the middle and have used them to hold thinner bully sticks and other treats. The blue one is fun to put smaller treats inside that she can work out like a puzzle. Obviously they are fun for fetch! We leave the other up and only get out when we can play with her because label said it is not a chew toy so we didn't want to take chances. Overall super fun and cool and good quality, human and dog approved LoL. ***We ordered the 2 set of 4" balls, blue and purple [they are same consistency of the blue ball] and love these too! Very fun and good at using with treats the sticks too, plus these don't get lost under sofas and furniture like the smaller ones, a big plus.
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Reviewed in the United States on November 28, 2025
★★★★★ 5
Glow and play - pups favorite!
Color: A) 2-Pack (2.5" Balls)
I can't say enough good things about this glowing fetch ball! It's perfect for outdoor play at night—my dog loves chasing it in the dark, and the bright glow keeps the fun going even after sunset. What really impresses me is the quality; this ball has withstood my pup's enthusiastic chewing (and believe me, he can demolish a regular ball in seconds). It’s durable and built to last, making it a fantastic investment for any dog owner. If you're looking for a fun nighttime activity, this glowing fetch ball is a must-have!
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Reviewed in the United States on January 15, 2026