The next two steps show how to measure high (600mA-10A) current.

The iFixit multimeter's high current (10A) port fuse is soldered to the multimeter's motherboard. If you suspect the current measurement is higher than 10A, don't use the multimeter to make the measurement. Instead, use a higher rated current meter or a clamp meter.

Measuring amp-level current can be dangerous even at low voltage (12V) levels! Follow these precautions:

Be very aware of what the probes are touching and make sure they don't accidentally touch anything conductive.

Be careful not to touch any exposed circuitry. If there's a significant chance of exposure, cover the live circuit with insulating material or wear protective equipment such as insulating gloves.

Plug the black lead into the COM port. Plug the red lead into the A port (the left port on the iFixit multimeter).

Turn the function dial to the amp A mode. If you're measuring Alternating Current (AC), press the blue select button to switch to AC mode.