For gauges of the same manufacturer, the dry density results compare within what tolerance? 2 pcf; 3 pcf

For gauges of the same manufacturer, the dry density results compare within what tolerance? 2 pcf; 3 pcf

• A. 2 pcf
• B. 3 pcf
• C. 2 pcf; 3 pcf
• D. 4 pcf

Answer: (C)

Understanding measurement tolerance for density gauges means recognizing that instruments have small differences due to calibration, model design, and field conditions. When comparing dry density results from gauges of the same manufacturer, you must use the tolerance specified for the specific gauge model. Some models require readings to agree within two pounds per cubic foot, while others allow up to three pounds per cubic foot. Therefore, the acceptable tolerance can be either two or three pcf, depending on the gauge, which is why both values are listed as correct. A four pcf difference would exceed typical manufacturer specifications and isn’t acceptable.

Understanding measurement tolerance for density gauges means recognizing that instruments have small differences due to calibration, model design, and field conditions. When comparing dry density results from gauges of the same manufacturer, you must use the tolerance specified for the specific gauge model. Some models require readings to agree within two pounds per cubic foot, while others allow up to three pounds per cubic foot. Therefore, the acceptable tolerance can be either two or three pcf, depending on the gauge, which is why both values are listed as correct. A four pcf difference would exceed typical manufacturer specifications and isn’t acceptable.