Bob from SWISCO responded:
October 14, 2021
Hello there. Measure the diameter of the plastic outer tube. It should either be 3/8" or 5/8". If it's 3/8" you need the S900-29. If it's 5/8", see our S600-29. If the color tip option is unclear, we advise you weigh the window sash. You can then match that exact weight with one of the weight ranges listed alongside each color tip option on either balance's shop page. |