Originally Posted by
3alarmer
If you really want a calibration device, it's not that hard
to set up a spoke with a given weight hanging vertically
from the free end. For our less than mission critical non
NASA purposes, it works well enough..
What do you mean "works well enough" there's no more accurate way to calibrate a tension meter than with a dead weight on the end of a spoke. It's a precisely known tension, with built in compensation for the stiffness of the spokes to be measured.
The only thing you could do to make it better, is to use 2 weights on either side of the target tension range, ie. 100kg and 125kg.