Abstract: Methods and apparatus for measuring grain characteristics, including grain test weight, using a container having one or more sensors. The sensors may include moisture, weight, grain flow, density, and level sensors. The container may be attached to a grain harvesting device, such as a combine, for measuring characteristics of grain harvested from test plots. Multiple containers may be employed with a grain diversion device so that sequential test plots may be harvested and measured with little or no interruption. The sensors, grain diversion device, and other equipment may be in signal communication with a signal processor for automated measurement.