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Proving Units

  • Di-Log PU690 690V AC Proving Unit
    In Stock - Express Delivery Available

    Di-Log PU690 690V AC Proving Unit

    £71.95 (ex VAT)
    £86.34 (inc VAT)
    • Provides 690V AC for testing voltage indicators
    • Ensures functionality in environments with unreliable power
    • Features high and low impedance device compatibility
    • Compact, lightweight, and safety rated for field use
    More info
  • Fluke PRV240 Proving Unit
    In Stock - Express Delivery Available

    Fluke PRV240 Proving Unit

    £151.26 (ex VAT)
    £181.51 (inc VAT)
    • Portable and battery-powered for convenience
    • Sources both AC and DC voltages
    • Ensures safety and reduces risk of electrical hazards
    • Compatible with a wide range of test tools
    More info
  • Fluke PRV240FS Proving Unit
    In Stock - Express Delivery Available

    Fluke PRV240FS Proving Unit

    £130.07 (ex VAT)
    £156.08 (inc VAT)
    • Sources 240V AC or DC steady voltage
    • Safe pre-test verification tool
    • LED status for AC/DC & FieldSense
    • Works with T6 & high impedance tools
    More info
  • Kewtech KEWPROVE3 Proving Unit
    Usually Ships In 6 to 13 Business Days

    Kewtech KEWPROVE3 Proving Unit

    £59.95 (ex VAT)
    £71.94 (inc VAT)
    • Proves circuits are dead before work
    • Drives high current voltage detectors
    • Steps down through voltage levels
    • Pairs with KEW1780/1790 testers
    More info
  • Martindale PD240 Proving Unit
    Usually Ships In 6 to 13 Business Days

    Martindale PD240 Proving Unit

    £64.95 (ex VAT)
    £77.94 (inc VAT)
    • Pocket-sized 240V DC proving unit
    • Current limited to maximum 2mA
    • Long battery life with switch-mode tech
    • LED indicator shows powered status
    More info
  • Martindale PD440S 440V AC Proving Unit
    In Stock - Express Delivery Available

    Martindale PD440S 440V AC Proving Unit

    £116.00 (ex VAT)
    £139.20 (inc VAT)
    • Provides reliable 440V nominal output for safe electrical testing
    • Compatible with a wide range of voltage indicators and testers
    • Durable and easy-to-use design with a magnetic hanger
    • Compact and portable for convenience in various work environments
    More info
  • Martindale PD440SX 440V AC Proving Unit
    In Stock - Express Delivery Available

    Martindale PD440SX 440V AC Proving Unit

    £105.95 (ex VAT)
    £127.14 (inc VAT)
    • Proves voltage indicators and test lamps up to 440V
    • CALCHECK verifies insulation and continuity testers
    • Stepped voltage thresholds with individual LED indicators
    • High-strength magnetic hanger for hands-free operation
    More info
  • Megger MPU690 Proving Unit
    In Stock - Express Delivery Available

    Megger MPU690 Proving Unit

    £92.05 (ex VAT)
    £110.46 (inc VAT)
    • 5 stepped voltage output from 50–690 V
    • Automatic probe-activated operation
    • Rugged case with magnetic base support
    • Long-lasting battery with LED indicators
    More info
  • Socket & See SP200 Professional Proving Unit
    In Stock - Express Delivery Available

    Socket & See SP200 Professional Proving Unit

    £81.90 (ex VAT)
    £98.28 (inc VAT)
    • The first proving unit to generate AC waveform for a true test
    • Compact design encourages routine safety checks
    • Automatic test function to conserve batteries
    • Step voltage LED's indicate voltage being generated
    More info
  • Socket & See SP400 Proving Unit
    In Stock - Express Delivery Available

    Socket & See SP400 Proving Unit

    £92.40 (ex VAT)
    £110.88 (inc VAT)
    • Tests multimeters, voltage indicators, and non-contact voltage detectors
    • Outputs from 50V to 690V with true AC waveform at 50Hz
    • Compact, battery-powered unit with automatic features
    • Reliable and safe testing for professional electricians
    More info

Proving Units

Within the safe isolation process, proving units work to ensure voltage testers, multimeters and other test instruments are functioning correctly by checking the accuracy of such testers against a ‘known’ voltage source. The proving unit acts as this known source.

Proving units should be used both before and after test instrument use, as the proving unit is then more likely to detect potential damage incurred through transportation or via the testing process itself. Our units enable engineers to safely verify the functionality of their instrument before live testing has even taken place.

The range of proving units stocked by Test4Less is curated to suit both low and high-voltage testers, and many offer additional features including slimline and lightweight design, long battery life and easy-to-read, LED indication. Shop our extensive range today!