The EC-2VA data logger is used by power distribution companies, facilities management, electrical or site services and maintenance engineers to monitor both voltage and current variations helping them to diagnose any related issues, or to gather data perhaps to make representations to their power supplier. As the product records both voltage and current, users can determine if low voltage is related to high current demands on site, or if the low voltage is being supplied to the site. This new model has detachable coils, allowing you to swap coils, the logger automatically adjusts to compensate for the coil used. You can even swap coils during logging and the logger will record the change. Note, the Rogowski Coils breaks open at the black joint, allowing it to be placed around cables (of up to 140mm diameter) without having to break the main circuit. Large Orange Rogowski Coils fit around 140mm/5” cables, the smaller Green coils fits 50mm/2” cables.