Letter bombs are bombs that trigger when the letter or
parcel is opened leading to a blast that can rip off fingers or damage eyes
etc. The Letter / Mail Bomb Detector consists of necessary electronic circuitry
for detection of metal in mails. The presence of any metal inside more than
certain threshold level, is indicated by an alarm. Due to the fact that metal
objects like pins, clips, staples may form part of the content of any mail, it
is necessary to pre adjust the sensitivity level to alarm only if the metal
content is beyond the routinely expected level. This will be the case if the
mail actually contains letter bomb due to the presence of the button cell and
wiring for connecting the cell to the circuit.
These
days biological agents are also being used as a means of spreading terror using
normal letters. Such agents are very difficult to detect. If any time you
suspect such a possibility then avoid any contact or inhalation of such agents
and seek professional help.
As a
general rule, if you are in the risk category then you should be careful in
opening letters from unknown addresses.
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