Otto Zorn antique grain tester scale, also known as a chondrometer. This specific model was manufactured by Otto Zorn in Merseburg, Germany, between approximately 1875 and 1900. Chondrometers are specialized instruments used to determine the quality and density of grain (bulk density) by measuring the weight of a specific volume of a sample. This measurement helps estimate the grain's commercial value, often expressed in units like pounds per bushel or kilos per hectoliter. Components as follows: Brass Cylinder: A precision-measured vessel for the grain sample. Balance Beam: A horizontal arm used to weigh the filled cylinder against known weights. Counterweights: A set of specialized weights (seen in the front compartment) used to find the balance point. Fitted Wooden Case: Original storage box designed to keep the precision brass components protected and organized. All major components are present, the smallest weight in the front compartment is missing.