Originally Posted by
BStrauss3
Why does the sensitivity of the WTMD vary between airports. I fly DFW-SEA and the exact same amount of metal (Titanium watch & bracelet, base metal belt buckle - small) ALWAYS sets off the WTMD @ SEA and NEVER @ DFW...
Doesn't matter which terminal @ DFW (A, C or D).
Always same pair of WTMD @ SEA.
WTMD are calibrated to different levels of sensitivities because different levels of metal are around different WTMD. It is why when you wear the exact same items, belt, watch, etc., you clear one WTMD but alarm another.
Often ther is steel in the floor that has to be accounted for, x-Ray machines near the WTMD that has to be accouted for too, and even electrical wires under the floor as well. You can actually set off a WTMD by being NEAR it, or passing something close to the outside of it.