The FIT0537 Magnetic Mixer from DFRobot does not include any power supply. Per the datasheet, the recommended power supply is “Wall Adapter Power Supply 12VDC, 1A (American Standard)”, but no plug dimension details are given.
Confirmed by DFRobot, the DC plug dimension is 5.5mm x 2.1mm (0.22x0.08"), with positive center.
You can find power supplies matching these specifications available from Digi-Key here: Compatible power supplies.
