Scrata Exposure Calculator.

A precision circular slide rule developed to calculate accurate exposure times for gamma radiography of steel castings.

Originally produced for the Steel Castings Research and Trade Association (SCRATA) by Blundell Harling Limited, this professional tool remains a practical and reliable solution for radiographic technicians.

Now supplied with branding from Castings Technology International and Lavender International, the calculator reflects its continued relevance within modern non-destructive testing (NDT) training and industry practice.