aleurometer

from The Century Dictionary.

• noun An instrument invented by M. Boland, about 1849, for ascertaining the bread-making qualities of wheaten flour.

from the GNU version of the Collaborative International Dictionary of English.

• noun An instrument for determining the expansive properties, or quality, of gluten in flour.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An instrument used for the examination of crude gluten as to its power of distending under the influence of heat, as a means of judging of the value of a flour for breadmaking.