Martindale PD440SRDX Proving Unit 440 V AC/DC +CALCHECK

The PD440SRDX is fast and easy to use, instantly supplying the full test voltage for both high and low-impedance voltage indicators, test lamps and meters. It comes complete with an over-moulded low-profile case and a magnetic hanger. The PD440SRDX has a unique CALCHECK feature, making it easy to verify the insulation and low resistance ranges on 18th Edition multifunction testers Ideal for proving indicators and measurement devices up to 440V AC or DC and to check the operation of 18th Edition installation testers.
Switchable AC / DC output mode via push button
CALCHECK for verification of resistance ranges on 18th Edition testers
Stepped voltage output matched to two-pole tester thresholds

Tough overmoulded low profile design
Long battery life with low battery indicator and auto power off