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Lots of videos on YouTube describing how to connect a voltage and amp meter here is a simple tutorial.
The voltage between the thin red and thin black lines must be within DC 4.5-30V
The ammeter can only be connected to the negative of the device under test
10A below ammeter (include 10A), built-in shunt, does not require external shunt When the black thin line vacant, it is better to use insulating tape around the exposed part of the wire, to prevent short circuits
If just be used as a voltmeter, it is recommended that the yellow line and the black line were connected together, to prevent the ammeter digital flashing
Working voltage: 4-30V DC
The maximum input voltage cannot exceed 30V; otherwise there is the danger of burning
Display: 0.28" Two colors blue and red
Measuring range: DC 0-100V 0-10A
Size: 48x29x21 mm/1.88*1.14*0.82 inch
Wiring:
Black line (thin): vacant or buck circuit (module) negative
Red line (thin): power supply+
Black line (thick): COM, common measuring
Red line (thick): PW+, measuring terminal voltage input positive
Yellow line (thick): IN+, current input+

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