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Calibration Tools, Dissolution

http://www.usp.org/frequently-asked-questions/dissolution-performance-verification-testing-pvt 

Factors affecting the PQ results: 
Temperature   not too significant  linear 

Speed    significant   10-30%

Vibration   significant   20-50%

Centricity   reasonable   ±  5-15%

Dissolved Gas  significant   ±  50% 

Media pH   reasonable   ±  5-10%

Media Contamination  significant   ± 20-45%

Sampling Position  not too significant  1-3%