We are having some concerns about the new door counters that have been
installed using an electronic beam.  The problem is that when a number of
people enter at the same time, we lose people.  The new counter that we have
is supposed to count legs, so at the end of the day we divide the total by
4.  I estimate that we may be missing anywhere from 10 to 25%, depending on
the group.

Some of the issues that we are dealing with:
 1-We don't charge admission so, no way to track there.
 2-Turnstiles while giving us an accurate count would be challenging
because of safety/accessability issues.
 3-Visitors that come in and out of the door more than once.

Answers I'm looking for:
 1-What methods of counting visitors are other facilities using.
 2-Do they use a formula to account for those passing through more
than once.
 3-If they use the electronic beam, a) how accurate are they
  b) do they use one unit or more
  c) what distance do they measure (I think ours is measuring
in a distance of about 25 ft)

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