channel balance

A quick learner from garden grove, ca says:
Hello! I need to replace channel balances for single hung window
The metal do not have the part number but the metal size is 28"
and x-panel size is 34-1/2 x 32
I am not sure how to calculate the weight of the panel
Could you recommend me please?
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Bob from SWISCO responded:

Thanks for writing in. We advise lowering the sash onto a bathroom scale to obtain an exact weight. That will help us choose the right stamp option. We also need to see the attachments or nylon fittings on either end of the metal channel. 

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