Tom from SWISCO responded:
June 1, 2017
The stamp option number you are showing us appears to be outdated. Modern balances that are used today use a different kind of rating system. Therefore, to choose the best option, you will need to weigh your window sash on a scale. Get back to us and let us know how you made out.
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Tom from SWISCO responded:
June 5, 2017
Yes, that sounds like exactly what you need!
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