Berg offers AWS Resolution Blocks coming in carbon steel, aluminum, stainless steel and other alloys. The AWS Resolution Reference Block is used for checking resolution capabilities of angle beam transducers. If you have any questions about Berg and our ultrasonic flaw calibration test blocks, please contact us at 1-847-577-3980 or send an email to info@bergeng.com. Our knowledgeable customer service staff is happy to assist you.