To Whom it May Concern
This is to certify that AGR International has stopped further production of the AGR Polariscope. This equipment has now been upgraded with an improved product version called Polarimeter.
The Polarimeter is designed to determine retardation values as related to residual stress in containers and glassware. This product fully meets industry requirements and can be operated in accordance with ASTM C-148 part B. One the main advantages to this device is the elimination of the need for strain disks. "