Cheap casio watches are used as bomb timers because they are ubiquitous. Any market stall selling watches in almost any country in the world will have a Casio F

Cheap casio watches are used as bomb timers because they are ubiquitous. Any market stall selling watches in almost any country in the world will have a Casio F-91W or a clone of it. If you wore a cheap Casio watch in an Arab country nobody would think anything of it because everyone else is also wearing them. Terrorists often wear boots, but wearing boots does not make one a terrorist.