Special 1A 3 digit ammeter, no shunt needed.
Specification
Power: 5V DC Accuracy: +/- 0.5%
Type: LED (Blue)
Range: 0-999mA
Resolution: 1mA
Size: 45mm x 26.5mm x 20mm
An independent power source is required. An isolated power module may be a good choice if sharing power with the load.