These are interesting. 360 servos with a hall effects encoder. For folks that want to keep track of where your robot is located. https://www.adafruit.com/product/3614
Excellent find! More servos to add to my collection.
They'll work well with the Arduino UNO EZ-B Firmware here: https://synthiam.com/Hardware/Hardware/Arduino-Genuino-Uno-17527
And the control that it uses here: https://synthiam.com/Software/Manual/Wheel-Encoder-Counter-17591
Excellent! That will be another addition to the ever growing arsenal.