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Originally Posted by KenWittlief
it will reflect off retroreflective tape up to 20 feet away, and off other surfaces that are much closer.
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Not true, as this year's Banner sensors are not the retroreflective model. This year the kit provided the "diffuse" model sensor instead, which is designed to sense a nearby object (100 to 400mm according to the specs). I haven't tried it, but according to the literature, these sensors shouldn't be able to detect retroreflective tape (unless it's really close, that is).
Check out
this link at Banner Engineering for a description of the two different modes. Click on "Choosing a Sensor: Sensing Modes" and then choose either "Diffuse" or "Retroreflective" on the left hand side.