The USP definition for stirring is that the shaft should be within ±2mm of the center. This parameter is fairly easy to measure in open-design dissolution baths but is more difficult to measure in the 'closed top' designs.
An off-center shaft can add significantly to the dissolution rate. Ensure correct centering with the use of our vessel centering gauge.
Vessel Centering Gauge Recalibration Service
Vessel Centering Gauge. Please state bath model when ordering to ensure compatibility.
Used for small volume dissolution (100ml/200ml vessels)