This Digital Ferrous Metal Proximity Sensor features a solid-state 3/8" permanent magnet to offer an intermediate detection gap of .58"
Output options include: 
An analog only and a digital and analog version. Our digital sensors feature an option of a NPN or PNP regulated voltage output. 
Extended Detection Option (2X) increases detection gap to .75"
These sensors come standard with a durable A75Q anodized aluminum housing, and a 4 pin male 12mm micro connector with integral flange.