This is a situational question. But under the presumption that you are in a somewhat dirty environment, depending upon your resolution requirements, how versed in electronics you are, I'd say a saturating Hall-effect sensor might be the ticket for you.
This is a situational question. But under the presumption that you are in a somewhat dirty environment, depending upon your resolution requirements, how versed in electronics you are, I'd say a saturating Hall-effect sensor might be the ticket for you.
