The Allington Suspension Bridge has to be constantly monitored for stress fractures as part of the Bridge safety. As well as having a main Stress Level Reader within the control room, hand held Stress Readers are used by the engineers for closer inspection.

In the episode Day Of Disaster, neither hand-held nor Control room readers picked up on the damage caused by a storm, which proved to be disastrous when the Martian Space Probe tried to cross the bridge.


Control room reader.


Chuck using a Stress Reader.