Order &
Advice Line
Teesside 01642 265426 Manchester 0161 6740168
London 0203 8295781 Birmingham 0121 7969657
International +44 203 8295780    
Proving Units
9 Item(s)
Set Descending Direction

View: list grid

  1. Kewtech KewProve 3 Proving Unit
    £95.00
    Save £37.05
    £57.95
    View Product

    Kewtech KEWPROVE 3 690V AC/DC Proving Unit

    • Instant ramp up and step down
    • High output for the highest range testers
    • Compatible with voltage testers
  2. Martindale PD240 Proving Unit pocket Sized kit
    £69.00
    Save £10.35
    £58.65
    View Product

    Martindale PD240 Pocket-Sized Proving Unit

    • Suitable for use with digital multimeters and voltage tester
    • Comes with belt clip, battery and instruction manual
    • Detects live voltage and proves dead
  3. Megger MPU690 690v Proving Unit for use with Voltage Indicators
    £108.00
    Save £39.00
    £69.00
    View Product

    Megger MPU690 Proving Unit

    • Generates voltage automatically in five steps
    • Supplied with carrying case
    • Suitable for use with all voltage indicators
  4. Martindale PD440 440V Proving Unit kit
    £89.00
    Save £13.35
    £75.65
    View Product

    Martindale PD440 Proving Unit

    • Designed for use with Martindale VI13700G and VI13700/2
    • Test Drummond and other filament test lamps
    • Also suitable for use with similar voltage indicators
  5. Martindale PD690 Proving Unit for use with Voltage Indicators
    £99.00
    Save £14.85
    £84.15
    View Product

    Martindale PD690 Proving Unit for use with Voltage Indicators

    • 700V AC proving unit
    • Allows voltage indicators to be checked for accuracy
    • Also suitable for use with Drummond and other filament test lamps
  6. Martindale PD430 50V & 440V Proving Unit for use with VAoltage Indicators
    £109.00
    Save £16.35
    £92.65
    View Product

    Martindale PD430 Proving Unit

    • Voltage proving unit for use with voltage indicators
    • Low 50V check and high 440V checks
    • Suitable for use with any voltage indicator (recommended for use with VI13700G and VI13700/2)
  7. Martindale PD700 50V and 700V high Current Indication Proving Unit
    £115.00
    Save £17.25
    £97.75
    View Product

    Martindale PD700 Proving Unit

    • Check voltage testers for ongoing accuracy
    • High and low voltage checks
    • Compact, portable design
  8. Martindale PD710 700V DC Proving Unit
    £119.00
    Save £17.85
    £101.15
    View Product

    Martindale PD710 700V DC Proving Unit

    • DC proving unit
    • Generates 700V
    • LED indicators
  9. Martindale VIPD138 Voltage Indicator & Proving Unit Set
    50% off Lockout Kit
    £159.00
    Save £23.85
    £135.15
    View Product

    Martindale VIPD138 Voltage Indicator & Proving Unit Set

    • Bundle pack with a voltage indicator, proving unit and carrying case
    • Great value
    • Save on buying separately
9 Item(s)
Set Descending Direction

View: list grid

Proving Units

About Proving Units

Proving units are calibration instruments that accompany voltage indicators/voltage testers. Before and after testing a proving unit should be used in combination with your voltage tester to make sure that correct operation is maintained and inaccurate results are not generated.

Each unit will generally have two recessed terminals where the user inserts the probes included with their two-pole voltage tester. The unit will then gradually apply each test voltage to the voltage tester, indicating whether or not the test was successfully completed.