cGMP Manufactured pH Buffers & Conductivity Standards Monitoring both the upstream and downstream processes is essential in biopharmaceutical manufacturing. Puritan’s cGMP manufactured pH buffers and conductivity standards enable reliable and accurate monitoring, prompt process management, and regulatory compliance of your critical biopharmaceutical manufacturing processes. Our proven, documented product quality and consistency—as well as our auditable traceability—will help minimize your process variability. With over 25 years of customer-centric manufacturing expertise, Puritan Products offers conductivity standards and pH buffers which are manufactured to the highest standard.