Which instrument is used to verify lighting levels during VT?

Which instrument is used to verify lighting levels during VT?

• A. Light meter.
• B. Stopwatch.
• C. Socket wrench.
• D. Paint color chart.

Answer: (A)

The main concept is using a device that measures how much light is present in the inspection area. A light meter provides a numerical readout of illuminance, typically in lux or foot-candles, so you can confirm the lighting meets the required level for reliable VT observations. This ensures consistent visibility of surface features and defects, reducing shadows or glare that could hide flaws. There are two common ways: an incident meter, which measures light falling on the surface, and a reflected meter, which measures light reflected from the surface to mimic what the eye or camera will see. Other tools listed don’t assess illumination: a stopwatch times events, a socket wrench tightens hardware, and a paint color chart is for color matching and reference, not lighting verification.

The main concept is using a device that measures how much light is present in the inspection area. A light meter provides a numerical readout of illuminance, typically in lux or foot-candles, so you can confirm the lighting meets the required level for reliable VT observations. This ensures consistent visibility of surface features and defects, reducing shadows or glare that could hide flaws. There are two common ways: an incident meter, which measures light falling on the surface, and a reflected meter, which measures light reflected from the surface to mimic what the eye or camera will see. Other tools listed don’t assess illumination: a stopwatch times events, a socket wrench tightens hardware, and a paint color chart is for color matching and reference, not lighting verification.