One will feature the ISO 17034 accreditation symbol indicating that the mixture is a Certified Reference Material (CRM):
The other will feature the ISO 17025 accreditation symbol indicating that the mixture is also a Calibrated Gas Mixture (CGM):
![UKAS 05710 Reference Materials Accreditation Logo](https://www.effectech.co.uk/wp-content/uploads/UKAS_Accred_RGB_white_on_blue_Reference_Materials_120.gif)
![UKAS 0590 Calibration Accreditation Logo](https://www.effectech.co.uk/wp-content/uploads/UKAS_Accred_RGB_white_on_blue_Calibration_120.gif)
One will feature the ISO 17034 accreditation symbol indicating that the mixture is a Certified Reference Material (CRM):
The other will feature the ISO 17025 accreditation symbol indicating that the mixture is also a Calibrated Gas Mixture (CGM):