Это китайский прорыв или калька чего-то известного?
DMS2800/DMS4700 series of high-precision, high-resolution magnetic rotary encoder digital servo belongs to high-performance steering gear, its running accuracy of the minimum resolution of 0.088 degrees. Maximum resolution of 0.35 degrees, which means DMS2800/DMS4700 Series magnetic rotary encoder digital servo will be smaller than the resolution of the dead zone 0.001ms. It is a real "zero dead zone" servo.
HK28012DMG Mi High Speed MG Servo 2.4kg / 0.08sec / 26g
The HK Mi Series servos represent the next break through in high precision servo technology. Using Magnetic Induction, rather than a potentiometer, for an unsurpassed level of accuracy and performance.