For measuring an expensive fabric such as brocade and gold foil, or for the fields of printing and photoengraving businesses, a unique tsubo unit called sun-tsubo is used, which is defined 1 sun-tsubo as an area in 1 sun square.
錦などの高価な織物や金箔、印刷、製版では1寸四方の面積を1坪としており、区別のためこれを寸坪という。