Simple Encoder Kit ~~ ®so The simple encoder kit from DAG consists of two neodymium 8-pole magnets with rubber hubs and two hall-effect sensors terminated with 150mm (Inch) cable and 3 pin’ formals servo headers. The magnets have 4 north poles and: 4 south poles and re strong enough that the sensor can detect the poles from more than This reads that the sensors do not need (0 be precisely mounted to detect the poles.