I am not sure about the stamp on my balancer

A quick learner from raleigh, nc says:
i have to replace a few balancer on my windows, but all i can see in the balancer stamp is this (12/2) unique 27-C-30, does this mean anything to you guys, or i just mesure the balancer and that will be good enough, the type that i need is the Series 795 Channel Balance. and i will need like 7 pairs thanks much for the help
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Donna from SWISCO responded:
For the Series 795 at 27 inch and looking at your current stamp number you most likely need the 27c stamp option. To check, remove the window sash and place it on a scale.

The S795-27 with stamp option 27c will carry a window sash weight range of 17 through 22 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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