What is the difference between single-track sensor magnetic ring and dual-track absolute magnetic disc?

Single-track sensor magnetic ring,Dual-track absolute magnetic disc,Radially Multipole Sintered Ferrite Magnets for Hall Induction Magnetic Encoder Motor,Ferrite Multipole Ring Magnet for Incremental (off-axis) Position Sensor
,Injection Moulded Plastic Ferrite Magnet Motor Encoder Magnet Ring,2-Tracks Axial Magnetic Target for Use with IC-Mu Nonius Encoder

Single-track sensor magnetic ring, you can understand it as one of the accessories of the incremental encoder. The incremental encoder calculates the rotation angle by outputting pulse signals. The reference point needs to be found again after each power-on. The incremental encoder is usually used in situations where the speed, distance or direction of movement needs to be determined. The price is cheaper.

Dual-Track Encoder Ring

Rotary Ring Encoders, Ferrite Magnetic Target, HUT150A64

Rated 5.00 out of 5

$9.95 – $18.95

Dual-track absolute magnetic disc is one of the accessories of the absolute encoder. It can directly output the unique binary code of the current position without returning to the reference point, so the position information can be maintained after power failure. Due to its unique memory function, it is more suitable for applications that require precise positioning, such as industrial robots, motor feedback encoders, brushless DC motor commutation, off-axis encoders, and even multi-axis measurement systems. The price is more expensive.