Below you will find several different versions of our Analog Ferrous Metal Proximity sensor. These produce an analog output that varies proportional to the gap between the sensor and a ferrous target. The first choice, the 275VPA is our smallest and most commonly used version. It is factory programmable to produce a 0 to 5V signal over just about any gap up to about .4". The other choices are all larger and very similar, with the difference being the magnet size. These larger magnet sensors can see targets up to a gap of about 1.4". Click on the box that best fits your needs, and you will be brought to the electrical option choice page. hoice page.