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Learn more by watching our Major Tech MT390 | Multifunction Installation Tester | Bluetooth 4.0 video.
Additional related video.
The MT390 is a robust, professional-grade 8-in-1 multifunction installation tester, engineered for electrical installers and commissioning professionals who need fast, accurate, and reliable test results on-site. It performs insulation resistance, RCD, loop impedance, earth resistance, PSC/PFC, voltage, continuity, and phase rotation testing — all from one compact unit.
Its bright 3.5” TFT colour display presents multiple test results clearly, while the intuitive soft key interface and on-screen wiring diagrams simplify setup and reduce user error. A sliding safety shield provides added protection during testing and charging.
Equipped with Bluetooth 4.0, Mini USB, MicroSD, and S-Video TV Out, the MT390 allows fast data sharing. Export reports in CSV format directly to iOS or Android devices, or transfer via USB. Whether testing in residential, commercial, or industrial environments, the MT390 is built to perform under pressure with a double-injection rubber housing and supplied hard carry case.
Fully compliant with IEC 61010 CAT IV 400V, this tester combines safety, connectivity, and versatility — making it a must-have for serious electrical professionals.
Q: What tests can the MT390 perform?
A: It performs insulation resistance, RCD, PSC/PFC, loop impedance, voltage, continuity, earth resistance, and phase rotation tests.
Q: Can test data be sent to a phone or PC?
A: Yes, it supports Bluetooth for iOS and Android, plus USB and MicroSD for exporting reports in CSV format.
Q: Is it safe for live testing environments?
A: Yes, it is rated to IEC 61010 CAT IV 400V and includes a protective slide shield for added safety during connection.
(MT390)
Warranty starts from Invoice Date
Domestic Use: 2 Year
Commercial Use: 2 Year
Warranty Method: Return to Sparky Direct
All Major Tech Meters sold through Sparky Direct are covered by the manufacturer’s warranty. If you believe your meter is faulty or defective, you may request an assessment under this warranty policy.
To initiate a warranty claim:
Return to Sparky Direct
Ship the meter back to Sparky Direct along with:
Please ensure the unit is securely packaged to prevent damage in transit.
Forwarded for Assessment
Upon receiving your meter, we will forward it to Major Tech’s authorised service centre for inspection, testing, and calibration.
Major Tech’s service lab will assess the returned unit to determine:
As Major Tech’s service labs are independent providers, Sparky Direct cannot govern or guarantee turnaround times or any costs incurred for repairs outside of warranty coverage.
| Function | Range / Details |
|---|---|
| Insulation Resistance | 125, 250, 500, 1000V; Measuring Range: 0.125 - 4000 MΩ; Short Circuit Current: 1mA |
| Earth Resistance | 99.99 - 2000Ω; Resolution: 0.01Ω |
| Low OHM | 400Ω; Resolution: 0.001Ω; Open Circuit Voltage: 5.8VDC; Measurement Current: 200mA |
| Voltage Measurement | 80 to 500V |
| Frequency | 45-65Hz |
| Loop Impedance | Range: 0.23Ω - 999Ω; Resolution: 0.01Ω; Measuring Current (Hi Amp): 8A - 25A |
| PSC/PFC | Range: 0 – 50kA |
| RCD Test | Test Current: 10mA, 30mA, 100mA, 300mA, 500mA, 1000mA; Modes: Auto x1/2, x1, x2, x5 |
| Interfaces | MiniUSB, Bluetooth, MicroSD, S-Video |
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Major Tech |
| SKU | MT390 |
| Barcode # | 6008229025365 |
| Package Weight | 0.631kg |
| Package Width | 0.220m |
| Package Height | 0.061m |
| Package Length | 0.095m |
| TYPE | VALUE |
|---|---|
| Type | Multifunction Testers |
| Brand | Major Tech |
| Height (mm) | 61 |
| Width (mm) | 95 |
| Length (mm) | 220 |
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