... (find attachment test parameters), use↑button (No.1) increase the power, use↓button (No.12) decrease the power.1.4 Press to the welding ... -by state, short time press top right button (↑): Power display screen shows value increase 1,the value will jump to lower limit ... -by state, short time press right middle button(↓): Power display screen shows value decrease 1, the value will jump to upper limit ...