This kit comes with a servo BLDC motor which can be driven in speed or position mode via RS485. Attached to the rotor is a diametrically magnetized magnet which rotates with the motor rotor. Above this magnet is an MA702 with a 1-2 mm airgap.
Download the following document prepared for this roadtest on how the MA702 angle sensor can be read / evaluated. Instructions for running the motor via an Arduino MEGA and RS485 driver are included.