Decided to replace broken channel balance, both sides with 19-005 and 15-004 but could not find markings for weight range is that weight approx of window and with a series fully assembeled do you get a right and left. Thank you
Tom from SWISCO responded:
April 6, 2015
If your original balances do not have a stamp, then you will need to weigh your sash on a scale and compare what you get to the chart listed on our S385-30 store page. Our balances are not sold in pairs, but the S385-30 can work on either the left or right side.