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    Voltage Proving Unit

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    EFO Manufacturers a range of battery powered true AC waveform output proving units. Our proving units provide a safe and reliable means of checking the correct functioning of Multi meters and two pole voltage indicators. before and after use as advised in the safe working practice for electricians. The test voltage generated is at 50Hz to synthesise a genuine test at AC mains supply frequency. Additionally they have the capability of checking the Operation of Non-Contact voltage detectors. Furthermore we select with best quality and value products. Consequently Saving you time on confusing options.

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    Safe Voltage Tester Verification

    Voltage Proving Unit

    Proving dead is the process of confirming that electrical equipment or
    conductors are not live before work begins. It is a core requirement of
    AS/NZS 4836 for safe work on low-voltage electrical installations.

    The process uses a voltage indicator together with a proving unit.
    First, check the meter or voltage indicator against the proving unit.
    Next, test the equipment or conductor. Finally, check the tester against
    the proving unit again to confirm it remained operational throughout
    the process.

    Proving units provide a safe and reliable way to verify the operation
    of multimeters, two-pole voltage indicators and other compatible
    testing devices before and after use.

    The EFO PU240 is a battery-powered proving unit that generates a
    240V true AC waveform output.

    The PU400 produces a ramping output from 50V to 690V and is recommended
    for checking compatible two-pole voltage testers.

    The PROVIT is designed to verify non-contact voltage testers, while EFO
    also offers proving units with both AC and DC output options.

    Using a reliable EFO proving unit helps confirm that your test equipment
    is functioning correctly before you rely on its readings.


    Before-and-After Testing


    Verify voltage testers before and after proving electrical equipment dead


    True AC Output


    Battery-powered proving units with genuine 50Hz AC waveform output


    Multiple Test Options


    Solutions for multimeters, two-pole testers and non-contact detectors

    Why Choose Us

    Why Choose Electrical Factory Outlet for Your Electrical Needs?

    At Electrical Factory Outlet, we understand that electrical testing
    accuracy and worker safety go hand in hand.

    Our range of EFO proving unit solutions is trusted by electricians
    across Australia for reliable operation in real-world electrical
    environments.

    EFO manufactures battery-powered proving units with true AC waveform
    outputs and selected AC and DC output configurations.

    These devices provide a safe and controlled method for checking the
    operation of multimeters and two-pole voltage indicators before and
    after use, as recommended in safe electrical working practices.

    The test voltage is generated at 50Hz to simulate the frequency of a
    genuine AC mains supply.

    Selected proving units can also verify the operation of compatible
    non-contact voltage detectors.

    We focus on supplying reliable, high-quality and practical products,
    helping electricians avoid confusing options and select suitable
    testing equipment for their work.

    • Battery-powered proving unit solutions
    • True AC waveform output generated at 50Hz
    • Options for checking multimeters and two-pole voltage indicators
    • Verification options for non-contact voltage testers
    • PU240 with 240V true AC waveform output
    • PU400 with ramping output from 50V to 690V
    • Selected AC and DC output configurations available
    • Locally stocked equipment and fast Australia-wide delivery

    ✓
    Tester Verification

    EFO Proving Unit for Accurate Tester Verification

    Electrical testing is only reliable when the test instrument itself is
    functioning correctly.

    A faulty or damaged tester may produce a false reading, potentially
    leading a worker to believe an energised conductor is safe to touch.

    An EFO proving unit provides a controlled voltage source that allows
    electricians to confirm their test instrument responds correctly
    before and after testing an electrical circuit.

    This verification step helps reduce the risk of false dead readings and
    supports safer electrical isolation procedures.

    ✓
    Controlled Test Voltage

    Multimeter and Voltage Tester Proving Units

    Multimeter Proving Units

    A multimeter proving unit provides a known voltage output that allows
    digital or analogue multimeters to be checked without relying on an
    exposed live circuit.

    Two-Pole Voltage Testers

    Ramping proving units such as the PU400 can verify compatible two-pole
    voltage indicators across a range of voltage levels.

    Non-Contact Voltage Detectors

    The EFO PROVIT is designed to check compatible non-contact voltage
    testers and confirm that they are responding before use.

    AC and DC Verification

    Selected EFO proving units provide AC and DC outputs for testers that
    require verification across both measurement types.

    Our Product Range

    Explore Our Complete Electrical Equipment Range

    At Electrical Factory Outlet, we provide a complete range of solutions to
    support electricians across testing, installation and electrical safety.


    01

    Electrical Test Equipment

    The range includes multifunction testers, insulation resistance
    testers, RCD testers, voltage indicators, test lamps, load testers,
    CAT IV clamp meters with LoZ and CAT IV multimeters with LoZ.

    It also includes contact and non-contact phase rotation meters and
    voltage-testing proving units.

    These tools help electricians diagnose faults, verify installations
    and confirm that electrical systems meet safety requirements before
    and after work is completed.


    02

    HV Test Lab

    Our current equipment configuration can test and certify insulated
    gloves to AS/NZS IEC 60903:2020 and AS 2225.

    Insulated mats can be tested to AS/NZS 61111:2020 and AS/NZS 2978.

    This helps ensure protective equipment meets relevant Australian
    standards and performs reliably under high-voltage working
    conditions.


    03

    Electrical Tools and Equipment

    Our range includes 1000V VDE insulated socket sets, spanner sets,
    pliers, side cutters, screwdrivers, torque wrenches, hexagon-key
    T-wrenches and Torx bit sets.

    Electrical hot sticks, telescopic fuse pullers and overhead-line
    products are also available.

    These tools are designed to improve efficiency while maintaining
    safety when working on live or complex electrical systems.


    04

    Level 2 ASP Equipment

    This equipment supports safe handling of network-level work and
    compliance with relevant industry requirements.

    The range includes harnesses, pole straps, pole-top rescue kits,
    service-line tensioners, service-line come-alongs, linesman’s scratch
    brushes, cable-core separation tools, IPC ratchet spanners and pole
    platforms.


    05

    Smart Metering Equipment

    Equipment and PPE required by smart meter installers may include
    low-voltage rescue kits, lockout kits, asbestos removal kits and NST
    Neutral Supply Testers.

    The range also includes CAT IV multimeters with LoZ functionality,
    voltage-testing proving units, phase rotation meters, test lamps,
    smart meter load testers, Type B first aid kits and FR clothing.


    06

    EV Maintenance and Safety Products

    Electric vehicle safety equipment includes specialised tools and
    protective equipment designed for working on EV systems as
    recommended by the Original Equipment Manufacturer guide or listed in
    AS 5732:2022 – Electric Vehicle Operations, Maintenance and Repair.

    This includes 1000V insulated tools, danger signage, exclusion-zone
    kits, arc-rated face shields, CAT IV multimeters, rescue hooks, car
    fire blankets, Class 0 insulated gloves, thermal imaging cameras and
    FR fire-resistant clothing.

    Using the correct equipment helps reduce risks and supports safer
    handling of high-voltage components.

    After-Sales Support

    Warranty & Returns

    EFO proving units, multimeter proving units and voltage proving units
    supplied by Electrical Factory Outlet are backed by a reliable
    warranty.

    For full details, refer to our Warranty & Returns Policy.

    Our voltage proving unit range is selected to meet strict quality,
    safety and performance expectations for professional electrical work.


    Contact our team

    Australia-Wide Delivery

    Shipping & Delivery

    We offer fast and reliable delivery across Australia for EFO proving
    units and related electrical testing equipment.

    Orders are processed efficiently to help ensure your multimeter proving
    unit, voltage tester proving unit or non-contact tester verification
    device is dispatched without unnecessary delays.

    Our proving unit range is stocked locally to support faster delivery
    for electricians, contractors and testing professionals.


    Ask about delivery

    Helpful Information

    Frequently Asked Questions

    Why can’t I use a wall outlet to test my meter?

    A wall outlet is not the safest or most controlled way to verify
    the operation of a voltage tester or multimeter.

    Using a wall outlet exposes the worker to a live electrical source
    and may not provide the known, repeatable output required for
    equipment verification.

    It also cannot normally provide several voltage levels or both AC
    and DC outputs.

    A voltage proving unit provides a controlled and repeatable voltage
    source designed specifically for checking compatible electrical
    testing equipment.

    Can any proving unit test any meter?

    No. Different testers and proving units have different voltage
    ranges, output types and input requirements.

    A multimeter proving unit must provide an output that the meter can
    safely detect within its measurement range.

    Two-pole testers, non-contact detectors and AC or DC meters may
    require different proving unit configurations.

    Always check the proving unit and tester specifications before use
    to confirm compatibility.

    Why is it important to use a proving unit before testing?

    Using an EFO proving unit before testing confirms that the voltage
    tester is responding correctly before it is relied upon.

    A damaged lead, depleted battery, faulty display or internal tester
    failure could prevent a device from detecting an energised circuit.

    Verifying the tester before use helps reduce the risk of receiving
    a false dead reading and unknowingly working on a live circuit.

    When should I use a proving unit?

    A voltage proving unit should be used immediately before and after
    testing an electrical circuit or conductor for the presence of
    voltage.

    The first check confirms the tester is operating before the circuit
    is assessed.

    The second check confirms the tester remained operational during
    the test and that the result can be relied upon.

    This before-and-after method is commonly known as the
    test-before-touch or live-dead-live verification process.

    What are the key features to look for in a proving unit?

    Important features include compatibility with the tester, suitable
    voltage output, stable waveform generation and straightforward
    operation.

    Consider whether the proving unit supports multimeters, two-pole
    voltage testers, non-contact detectors or both AC and DC
    measurements.

    Portability, durability, battery operation and visible output
    indication are also useful for field work.

    The selected multimeter proving unit should match the tester’s
    input range and the electrical verification procedure being used.

    Can a proving unit improve safety on-site?

    Yes. Using a voltage tester together with a proving unit provides
    greater confidence that the tester is functioning correctly before
    it is relied upon.

    This reduces the risk of a worker assuming a circuit is isolated
    because of a faulty or non-responsive test instrument.

    A controlled proving unit output also avoids the need to verify a
    tester against an exposed live circuit or wall outlet.

    Proving units support safer isolation, maintenance, inspection and
    fault-finding procedures.