Available in thru-beam, retroreflective and diffuse reflective versions, with NPN or PNP output, and a sensing range from .1 to 10 meters. They measure 10 x 20 x 31 mm for easy mounting in small areas.
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NaiS(TM) UZA photoelectric sensors from Aromat (New Providence, NJ) have a continuously-variable potentiometer for simple adjustments of light intensity.
Available in thru-beam, retroreflective and diffuse reflective versions, with NPN or PNP output, and a sensing range from .1 to 10 meters. They measure 10 x 20 x 31 mm for easy mounting in small areas.