I want to record the displacement of a small magnetic ball moving sideways across the face of the sensor. I've had a close look at AMS's catalog of magnetic position sensors and I'm not sure how to choose one. If I'm working with a movement range of <5mm and want a resolution of 5-10μm, and also want one that can handle wet conditions, which would I choose? I assume a linear position sensor would be preferable to an angular one, but from there I'm unsure. This is the list http://ams.com/eng/Products/Magnetic-Position-Sensors Perhaps another manufacturer would be better?