Pololu-3081-Magnetic-Encoder-Pair-Kit-for-Micro-Metal-Gearmotors-Pololu-3081-p-The-Pololu-3081-Magnetic-Encoder-Pair-Kit-includes-two-dual-channel-hall-effect-sensor-boards-and-two-6-pole-magnetic-discs-that-can-be-used-to-add-quadrature-encoding-to-two-micro-metal-gear-motors-with-extended-back-shafts-p-p-The-encoder-senses-the-rotation-of-the-magnetic-disc-and-provides-a-resolution-of-12-counts-per-revolution-of-the-motor-shaft-when-counting-both-edges-of-both-channels-To-compute-the