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        Learn more by watching our Major Tech MT390 | Multifunction Installation Tester | Bluetooth 4.0 video.

        Additional related video.

        Major Tech MT390 | Multifunction Installation Tester | Bluetooth 4.0

        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.

        MT390 Features

        • 8-in-1 functionality: Insulation, earth resistance, loop impedance, PSC/PFC, RCD, phase rotation, voltage, and low-ohm continuity.
        • 3.5” colour TFT display: Bright, full-colour screen with clear multi-value layouts.
        • Wireless & USB transfer: Bluetooth, Mini USB, and MicroSD for exporting results.
        • Live on-screen help: Connection diagrams shown during setup for fast reference.
        • Site-ready build: Durable rubber housing with safety shield and hard carry case.
        • Compliant & safe: Meets IEC 61010 CAT IV 400V safety standards.

        FAQ

        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)

        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.

        • Items must be unused, with all parts, accessories, and original packaging.
        • We can’t accept returns if the product is damaged, incomplete, or not in resalable condition.
        • Proof of purchase is required.
        • Return shipping is the responsibility of the customer. 

        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

        • Warranty starts from the Invoice Date
        • Some suppliers offer in-home warranties and handle claims directly, so you won’t need to uninstall or return the product. Chat with us to check if your product qualifies.
        • Sparky Direct isn’t responsible for losses caused by product failure.
        • Warranties are void if products aren’t installed by a licensed electrician.

        Damaged or Faulty Goods
        If your order arrives damaged or is faulty, let us know within 24 hours.

        • Sparky Direct will pay for return shipping via an emailed return label.
        • If the fault is confirmed, we will send you a replacement item or provide a refund.

        Contact us via our chat to arrange the return.

        Exclusions
        We can’t accept returns for:

        • Items that have been installed, modified, or used
        • Clearance, End of life, Discontinued, or special order items (unless faulty)
        • All PPE Items
        • Goods returned without original packaging or proof of purchase

        How to Request a Return

        1. Contact our customer service team with your order number.
        2. Confirm it’s eligible under our return or warranty policy.
        3. Pack the item securely and return it using a trackable service.
        4. Once we receive and inspect it, we’ll process your refund or replacement.

        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.

        How to Lodge a Warranty Claim

        To initiate a warranty claim:

        1. Return to Sparky Direct
          Ship the meter back to Sparky Direct along with:

          • A copy of your proof of purchase
          • A brief description of the issue
          • Your contact details

          Please ensure the unit is securely packaged to prevent damage in transit.

        2. Forwarded for Assessment
          Upon receiving your meter, we will forward it to Major Tech’s authorised service centre for inspection, testing, and calibration.

        Assessment Process

        Major Tech’s service lab will assess the returned unit to determine:

        • Whether the fault is due to a manufacturer’s defect (covered under warranty), or
        • If the issue is the result of user error or no fault is found.

        Outcomes

        • If approved under warranty: The product will be repaired or replaced at no cost to you.
        • If not covered under warranty: The lab may offer repair services, which will be quoted and billed directly to you by the service provider.

        Important Notes

        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.

        Please allow up to 7-14 working days for the return of your product.

        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
        View Datasheet
        TYPE VALUE
        Type Multifunction Testers
        Brand Major Tech
        Height (mm) 61
        Width (mm) 95
        Length (mm) 220
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