These 4mm DC-powered (10-30V) inductive proximity sensors detect the presence of ferrous metal objects at triple sensing distances (up to 2.5mm); other metals may reduce detection range. These small cylindrical sensors with smooth or threaded barrels are ideal for tight spaces and close-in sensing, and are available with integral 2m pigtail cable or quick-disconnect.
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Would you buy this item again? Undecided
I used 3 of these to detect a meta ring in an over molded part for not only ring presence, but also to make sure the ring was fully seated and in the correct position. After a while of troubleshooting why some parts would show ok and others didn't, I decided to check the sensing distance on these sensors. They claim it has a 2.5mm (0.098") sensing distance. I measured about .635 (0.025") before it would come on.