Visual inspection is easy to apply, quick and relatively inexpensive, and requires no special equipment other than

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Multiple Choice

Visual inspection is easy to apply, quick and relatively inexpensive, and requires no special equipment other than

Explanation:
Visual inspection relies on the observer’s eyes as the primary detecting instrument. It’s quick and inexpensive because you don’t need specialized tools—only adequate lighting to make surface flaws visible. Good eyesight is essential because, with nothing but the human eye, the inspector must be able to perceive defects directly; without sharp vision, even well-lit surfaces can hide flaws. The other options introduce equipment or specific lighting levels that aren’t required for a basic visual check, whereas relying on clear, unobstructed vision is what makes this method straightforward and low-cost.

Visual inspection relies on the observer’s eyes as the primary detecting instrument. It’s quick and inexpensive because you don’t need specialized tools—only adequate lighting to make surface flaws visible. Good eyesight is essential because, with nothing but the human eye, the inspector must be able to perceive defects directly; without sharp vision, even well-lit surfaces can hide flaws. The other options introduce equipment or specific lighting levels that aren’t required for a basic visual check, whereas relying on clear, unobstructed vision is what makes this method straightforward and low-cost.

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