The answer is a Threshold Value
The pH level of the substance is low, indicating that it is acidic.
The substance has a low pH level, indicating that it is acidic.
A decision based on what constitutes an acceptable level of risk
The "acceptable noise level" will depend on your specific needs! What is "acceptable" in one situation, may be utterly unacceptable in another.
It depends to the acceptable risk level in your company. Usually AFR=10 is acceptable in most companies.
Couple percents.
AQL - acceptable quality level
40-45db
It tries to attain an acceptable level of veracity.
acceptable error level
one percent
5 mg/L