Tom from SWISCO responded:
April 10, 2014
Usually these balances have a number stamped on the metal channel. You can use that to determine which option you have. However, it might be a good idea to remove your sash entirely and place it on a scale to get the weight. The S795-26 has a chart that lists each option and how much weight each can support. Simply cross reference your sash weight with that chart and you'll have your answer!
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