The device's narrowly focused beam allows detection of very small objects. A potentiometer sets sensitivity. A sharply concentrated 660-nm red laser beam indicates alignment. The sensor sits in a short, M18 stainless-steel housing with an excess light indicator. Available versions include either changeover outputs or excess light output (light on).

Contrinex Inc., 2 Business Park Rd., Old Saybrook, CT 06475, (866) 289-2899,