Some of the Shure scales have a steel arm, while others, like mine, have aluminum. I simply cannot believe that Shure ever made such a mistake, but they did. Find another one if you plan to keep using a Shure gauge.
As an aside, I've compared the Shure to my digital scale and it is very accurate. But, the "repeatability" factor as accomplished by the digital is one that cannot be beaten by the Shure. Otherwise, they are about a wash and you should always do a final fine tune by ear anyway.
As an aside, I've compared the Shure to my digital scale and it is very accurate. But, the "repeatability" factor as accomplished by the digital is one that cannot be beaten by the Shure. Otherwise, they are about a wash and you should always do a final fine tune by ear anyway.