Correct AMPS & volts for DC motor controller
The controller you have identified will work.

However, bear in mind that this controller is NOT providing any isolation from the line voltage. This is risky enough with the control potentiometer shown -- its internal insulation needs to be rated for this type of application, and many inexpensive units are not. But if you eventually want to control this with an Arduino or other microcontroller, it will be up to you to provide the necessary galvanic isolation.