Glassware calibration

What is referance guideline for glass ware calibration?

Class A volumetric glassware which comes with its own ASTM certification should
be all you have ever used.

But still is it require verification for the A class glassware??

Class A glassware has a certificate of calibration hance it is not required.

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No need to again for a grdae and b grade calibration to be performed as per perri

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What is b grade calibration?

With out cerified glasswere known as B grade

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I would like to point out that the standards and control results (SOP) verify you have used suitable glassware.

Performance Verification is required,

Pharmaceutical Guidelines
SOP for calibration of Glassware
Test method # 〈31〉 VOLUMETRIC APPARATUS- USP 35