One Pen Doesn’t Work

You find that when you pick up one of the pens, it doesn’t
work. That’s odd. The rest are fine. It could be that the
sensor is covered in debris. Sometimes dust from moved
ceiling tiles falls onto the pen sensor and the light can’t get
to it. In one school, they were doing science experiments
with seeds and the seeds were covering the sensor so that
it couldn’t tell that the pen was picked up. Make sure that
the area under each pen is kept dirt free. You can clean
the sensor by vacuuming and by putting a bit of blue glass
cleaner on a cotton swab and wiping it.

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