Digital Display Ammeter DC 0-100A Blue (018-05-AM-100A-BL)

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Wide supply voltage operating range; 4.5-28VDC, current sample range is DC 0-100 Amps.

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Does the metre read +/- amps. I need to have it in a battery circuit where I need to know whether the battery is charging or discharging. Thks for any advice