Surveillance

Surveillance is the systematic observation and monitoring of a person, population, or location, with the purpose of information-gathering, influencing, managing, or directing.

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The lock-grade and safe-rating figures throughout this site are drawn directly from the published ANSI/BHMA A156 and UL 72/687 standards — see the ratings reference. Calculators run real math, not AI estimates; guides and articles are written and edited in-house.