Proving Unit - PD440SX

This proving unit comes with a CALCHECK feature, designed for use with installation testers and fe...

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This proving unit comes with a CALCHECK feature, designed for use with installation testers and features 4 stepped voltage thresholds. It helps verify insulation and low resistance ranges on-site. The unit also includes a magnetic hanger and a long battery life with a low battery indicator.

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Model Part NumberPD440SX
BrandMartindale Electric