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I have a device very similar to this but mine has 4 legs. And apparently it is a speed sensor but I do not have any information about this sensor. I want to measure the magnetic field but I only have this device that has seems to be the sensor Hall transistor has a number: 3144. Also buy that looks like a transistor, but only. The seller told me it's a Hall sensor but I have no information on how to use them. Can you help me? Or if you can recommend some module or sensor to measure the magnetic field with arduino and matlab. Thanks in advance