Martindale PD440 440V AC Proving Unit

  • Safely and simply proves the operation of voltage indicators and test lamps
  • Essential for implementing effective safe isolation procedures
  • 440V industry leading proving unit for all low and high impedance testers
  • Long battery life time with low battery indicator
  • Optional in-car & mains power supplies available
EAN: 5036162185816 SKU: MARPD440 Category:

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Martindale PD440S 440V AC Proving Unit


The Martindale PD440 is a 440V AC proving device, designed to enable voltage indicators to be fully checked, in compliance with Health & Safety recommendations. Using a voltage indicator without first proving it is working correctly could prove fatal.

The PD440 is compatible with the new Martindale VI13800 & the Martindale VI13700.

It can also be used to check Drummond and other filament test lamps as well as standard multimeters and other manufacturers two pole voltage indicators.

There is now a facility to power the PD440 proving devices with the addition of a 12V DC power connection point. The units can be powered by either alkaline batteries or a 12V power supply. There are two power supply units available for the proving devices, the PSUPD230 and the PSUHPAT12. The PSUPD230 can be connected to mains power and the PSUHPAT12 is a 12v power supply suitable for use in a car/van cigarette lighter.




Maximum Voltage Output240V DC440V AC440V AC
LED Voltage Thresholds240V50V, 440V440V
High Voltage LED
Low Battery LED
High/Low Z Compatible
Suitable forMultimeters & voltage testers (>120kΩ)Multimeters, voltage testers & Drummond test lampsMultimeters, voltage testers & Drummond test lamps





This product has been discontinued.

Out of stock