This is a LED digital display panel meter that can measure both voltage and current with a measuring range of 0 to 100V & 0 to 10A.
Wiring:
Black line (thin): Power supply -
Red line (thin): power supply +
Black line (thick): COM, common measuring
Red line (thick): PW+, measuring terminal voltage input positive
Yellow line (thick): IN+, Voltage input+ (Measuring)