18"series 795 channel balance

A quick learner from 795 channel balance product s795-18 says:
Product #S795-18

on the balance it is stamped 18-7-BSI

do i ordered B or is it 7lbs which would be A

i need to order 2 of them
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Tom from SWISCO responded:
I can't say for sure, your stamp isn't familiar to me. I recommend weighing your sash on a scale and referring to the chart displayed on the S795-18 store page. That will let you know exactly what option would be best.
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