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Learn more by watching our Major Tech MT390 | Multifunction Installation Tester | Bluetooth 4.0 video.
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The Major Tech MT390 is a multifunction installation tester rated CAT IV 400V, combining eight integrated test functions including insulation resistance, loop impedance, RCD, earth resistance, voltage measurement, phase rotation and PSC testing. The unit features a 3.5" TFT colour display with on-screen wiring diagrams, Bluetooth 4.0 connectivity, and internal memory for on-site data recording and smartphone transfer via the companion app.
Electricians performing installation testing and commissioning work typically need to carry multiple specialist testers to verify compliance across insulation, loop impedance, RCD and earth resistance systems. Carrying separate instruments increases tool kit bulk and weight on site, slowing work between jobs. The Major Tech MT390 consolidates eight test functions into one portable unit, reducing tool complexity and enabling faster testing workflows across domestic, commercial and industrial installations without the need for multiple devices.
Licensed electricians value all-in-one testers because they reduce the number of specialist tools needed for compliance verification work and support faster on-site reporting through Bluetooth data transfer to smartphones. The MT390's internal memory and software eliminate manual paperwork, which saves time between jobs and supports rapid site-to-office handoff. The rugged rubber housing and CAT IV 400V rating support daily use on diverse electrical projects, from routine maintenance and fault finding to full system commissioning work.
The Major Tech MT390 is not suitable for testing systems with voltage above 500V or currents exceeding 50kA PSC. Do not use for high-voltage transmission testing, EV charging installation verification, or specialized industrial control systems that require dedicated instrumentation beyond CAT IV 400V scope.
(MT390)
It is used for full installation testing, covering everything from insulation to RCD and earth checks in one unit.
Yes. It combines most common test functions, so you don’t need separate testers.
Yes. It covers the key tests needed for verification and commissioning jobs.
Yes. You can store results and transfer them via Bluetooth, USB or MicroSD.
Yes. It helps quickly identify issues across circuits and installations.
Yes. Sparky Direct stocks the Major Tech MT390 with fast dispatch and delivery across Australia.
Yes. The MT390 covers all eight test functions required for installation compliance work: insulation resistance, loop impedance, RCD, earth resistance, voltage, phase rotation and PSC testing. It is CAT IV 400V rated and complies with IEC 61010 safety standards, making it approved for domestic, commercial and industrial electrical installations under Australian standards.
Insulation resistance (125V–1000V up to 4000MΩ), low ohm (400Ω at 0.001Ω resolution), earth resistance (99.99–2000Ω), voltage measurement (80–500V), frequency measurement (45–65Hz), loop impedance (0.23Ω–999Ω), RCD testing (10mA–1000mA modes with pass/fail), and phase rotation. All functions are accessible from soft key menus on the 3.5" colour display.
The MT390 records test results to internal memory and transfers data via Bluetooth to iOS and Android smartphone apps for instant report generation. Alternative transfer options include MiniUSB (direct to computer), MicroSD card (removeable storage), and S-Video output. Test reports export to CSV format for email distribution without manual data entry.
The MT390 offers two battery options: a removeable lithium battery pack rated for 500 charge cycles and an internal lithium battery rated for 1000 cycles. The removeable pack allows quick field replacement between jobs without downtime, while the internal battery provides extended operation during full-day testing schedules.
All Major Tech meters sold through Sparky Direct come with a 2-year manufacturer's warranty covering defects in materials and workmanship. Warranty claims are handled through Sparky Direct, which forwards the meter to Major Tech's authorised service centre for assessment and repair or replacement. Return shipping to Sparky Direct is covered by Sparky Direct under the warranty process.
The MT390 is equally suitable for maintenance and fault diagnosis as it is for compliance sign-off. The eight integrated functions allow you to quickly identify circuit faults, earth resistance problems, disconnections and insulation breakdowns across multiple installation types without needing to carry separate testers. This makes it cost-effective for mixed maintenance and compliance work.
The MT390 is supplied with earth resistance measurement spikes and test leads as standard accessories, plus a hard plastic carrying case for on-site and vehicle transport. Additional test leads and specialised adapters are available from Major Tech, and the unit also supports optional Bluetooth data transfer via the companion smartphone app (iOS and Android supported).
The Major Tech MT390 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
100-Day Fuss-Free Returns
We want you to love what you buy—but if you change your mind, that’s okay too. That’s why Sparky Direct offers a 100-day money-back guarantee.
If your item isn’t in its original condition, please contact us before returning it—we might save you time and money.
All products come with a manufacturer’s or supplier’s warranty
Damaged or Faulty Goods
If your order arrives damaged or is faulty, let us know within 24 hours.
Contact us via our chat to arrange the return.
Exclusions
We can’t accept returns for:
How to Request a Return
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 | 5.700kg |
| TYPE | VALUE |
|---|---|
| Type | Multifunction Testers |
| Brand | Major Tech |
| Height (mm) | 61 |
| Width (mm) | 95 |
| Length (mm) | 220 |
| Power Source | Removeable Lithium Battery Pack (500 cycles) / Internal Lithium Battery (1000 cycles) |
Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.
Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.
Tools sold by Sparky Direct must be used safely and in accordance with the manufacturer’s instructions. Customers are responsible for ensuring they have the necessary knowledge and competence to operate any tool purchased. If you are unsure how to safely or correctly use a tool, do not use it and seek guidance from the manufacturer or a suitably qualified professional.
Nothing in this clause limits or excludes any rights or guarantees available under the Australian Consumer Law.
For website terms and conditions https://www.sparkydirect.com.au/terms-of-use
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