SFOEDL differences shall not exceed what percentage of GAO?

• A. 0.5%
• B. 1%
• C. 2%
• D. 5%

Answer: (B)

In this type of measurement check, you set a tolerance for how far the SFOEDL values can differ from the GAO baseline so that data used for decisions remains reliable. The acceptable limit is one percent of GAO. This level balances the natural variability and instrument measurement errors you’ll see across equipment, while still catching meaningful shifts that could affect safety or performance. If you allowed more deviation, such as two or five percent, you’d risk acting on data that isn’t truly representative. If you tightened it to half a percent, the tolerance could be needlessly strict given normal instrument drift and calibration limits. So, keeping the difference within one percent provides a practical, safe standard.