On page 8, there is a tiny diagram labeled "Warning." Here is what that actually means:
: The module uses a simple interface—two wires for the DC input and two for the regulated output. Practical Project Ideas Zk-5kx Manual
Many users find that these units benefit from a quick calibration to match their multimeter's readings. If your display seems slightly off, you can enter the calibration menu (usually by holding the encoder or specific button combinations) to fine-tune the accuracy. On page 8, there is a tiny diagram labeled "Warning
Press the button again while in the voltage setting interface to switch to the current limit ( A ) setting. On page 8