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If a nger is placed inside the open space surrounding the AT550’s nosepiece, the
unit’s screen will change to that shown below.
Instructions for Use - Touch Sensor
This is meant to prevent damage to the instrument and/or to prevent the
possibility of causing injury to the patient. Should this situation arise, make sure
the patient is not touching the AT550 anywhere near its nosepiece. The instrument
will not function until the nger is removed.