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Proving Units

Choose The Right Proving Unit

For voltage indicators that have a maximum 400V test range, you need the Martindale PD430 or PD440. If your voltage indicator has a maximum 690V test range, you will need the Martindale PD690 or PD700.

Always use a proving unit that will check the full range of your voltage indicator to ensure it is working correctly.

If you have a DC specific application, the Martindale PD710 will prove up to 700V DC.

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  1. Martindale PSUPD230 Proving Unit Power Supply (UK 230V/12V, 2200MA)
    Martindale PSUPD230 Proving Unit Power Supply (UK 230V/12V, 2200MA)
    £46.80 £39.00
    Limited stock

  2. Martindale PD690S-C, 690V AC Proving Unit with Soft Carry Case (fits VI)
    Martindale PD690S-C, 690V AC Proving Unit with Soft Carry Case (fits VI)
    Regular Price £184.80 Special Price £154.01 £128.34
    In stock

  3. Martindale PD690SRD – 690V AC/DC Proving Unit with 5 ranges
    Martindale PD690SRD – 690V AC/DC Proving Unit with 5 ranges
    Regular Price £174.00 Special Price £142.81 £119.01
    In stock

  4. Martindale PD440SRDX – 440V AC/DC Proving Unit with 4 ranges & CALCHECK
    Martindale PD440SRDX – 440V AC/DC Proving Unit with 4 ranges & CALCHECK
    Regular Price £168.00 Special Price £149.82 £124.85
    In stock

  5. Martindale PD440SRD – 440V AC/DC Proving Unit with 4 ranges
    Martindale PD440SRD – 440V AC/DC Proving Unit with 4 ranges
    Regular Price £156.00 Special Price £138.01 £115.01
    In stock

  6. Martindale PD230SRD – 230V AC/DC Proving Unit with 3 ranges
    Martindale PD230SRD – 230V AC/DC Proving Unit with 3 ranges
    Regular Price £130.80 Special Price £94.88 £79.07
    In stock

  7. Martindale PD440S, AC Proving Unit (440V)
    Martindale PD440S, AC Proving Unit (440V)
    Regular Price £139.20 Special Price £106.73 £88.94
    In stock

  8. Martindale PD440SX, AC Proving Unit (440V) with CALCHECK
    Martindale PD440SX, AC Proving Unit (440V) with CALCHECK
    Regular Price £162.00 Special Price £123.61 £103.01
    In stock

  9. Martindale PD690S, AC Proving Unit (690V)
    Martindale PD690S, AC Proving Unit (690V)
    Regular Price £147.60 Special Price £77.99 £64.99
    In stock

  10. PD240
    Martindale PD240, DC Proving Unit (240V)
    Regular Price £106.80 Special Price £77.47 £64.56
    In stock

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