Reddit reviews Uxcell LJ12A3-4-Z/BY PNP NO 3-Wire Cylindrical Inductive Proximity Sensor Approach Switch, DC 6V - 36V, 4 mm
We found 2 Reddit comments about Uxcell LJ12A3-4-Z/BY PNP NO 3-Wire Cylindrical Inductive Proximity Sensor Approach Switch, DC 6V - 36V, 4 mm. Here are the top ones, ranked by their Reddit score.
Product Name: Inductive Proximity Switch; Model: LJ12A3-4-Z/BY; Theory: Inductive Type SensorWire Type: DC 3 Wire Type (Brown, Black, Blue)Switch Appearance Type: Cylinder Type, Metal ShellOutput Type: PNP, NO; Detecting Distance: 4mm/0.2''; Supply Voltage: DC 6-36VNet Weight: 47g; Color: Silver Tone, Blue, Black; Package Content: 1 x Inductive Proximity Switch
No, its PNP. Says so right on the sensor.
EDIT: Here is the link. http://www.amazon.com/Cylindrical-Inductive-Proximity-Approach-LJ12A3-4-Z/dp/B007Q813UA
To my knowledge, the most affordable option would to purchase an Inductive proximity sensor which purpose is to detect metal objects within a certain range.
http://www.ebay.com/bhp/inductive-sensor
http://www.amazon.com/Amico-Cylindrical-Inductive-Proximity-LJ12A3-4-Z/dp/B007Q813UA/ref=sr_1_1?ie=UTF8&qid=1381861724&sr=8-1&keywords=inductive+sensor