YES, The BET (Brunner-Emmet-Teller) method is the most common one for measuring surface area of nanomaterials...
Stephen Brunauer, P.H. Emmet and Edward Teller developed BET theory in 1938.
The BET method is based on adsorption of gas molecules on surface. The amount of gas adsorbed at the given pressure allows to determine the surface area.
Find more about BET theory here: https://en.wikipedia.org/wiki/BET_theory
We have graphical representation for calculations on surface area from these devices(BET instruments).