Hi ApexSpeed,
Well I have a spring dyno, a very good and precise tool.
I wish I have never used it. Why?
Just because I had measured all my springs, from several makers and man, you can end with such a difference between the same color range, that your wish is to through them away. We pay a huge amount of money for a piece of colored steel, and please don't trust that the same color from the same maker produces the same weight, far from it. I have even a spring pair that the difference between the two are almost 120gr. Incredible isn't it?
Then I have taken out all the springs color and have matched them by weight. Nice to see and have, but if you twist free your car with 4 good scales, isn't worth the trouble.