Calibrate Tensiometer I want to calibrate my Park Tool TM-1 for my weird spokes. I want to build a box with some kind of weight measuring device where a spoke can be put under 1600N of tension.

Rumours on other boards say that using a spring scale would yield wrong results, because the spring would move while measuring. I don't quite know if that is true or not?

Because I want a cheap solution, I don't want to spend 50 euros on a digital scale. Now I found a "butcher's scale" on ebay here. Can I use that for my purpose, or will it also yield wrong tensiometer reults? I don't really understand the rational behind a spring scale messing up the results. Can someone shed some light on this?

Edit: Here is a picture and the discussion from some other board.
I'm not sure what you're after here. Is your spoke type not available on Park's TM-1 Tension Meter Conversion Table? You're after relative spoke tension when you're measuring your tension as it's going to be different at different points from the hub to the rim. 1600N is well within the range of measurement for the TM-1 on almost all spoke types