The difference between magnetic encoder and photoelectric encoder - CALT Sensor
Magnetic Incremental Encoders – Medital
i.ytimg.com/vi/_1tGosBLRB0/maxresdefault.jpg
GMW Associates - Asahi Magnetic Encoder IC
Amazon.com: MGT010-42ST magnetic encoder for stepper Motor and bushless DC Motor Incremental output DC 5V 1000 PPR (MGT010-42ST 15.533) : Industrial & Scientific
Difference between optical, magnetic and capacitive encoders? | US Digital
Huge Savings on Magnetic Encoders | Anaheim Automation