A professional who weighs roving samples from wool carding machines and adjusts machines to produce roving of specified weight. Responsibilities include:

• Measures roving with ruler to obtain sample of specified length.
• Weighs sample and compares weight with standard chart to detect variations.
• Moves weight on weight-control lever of carding machine to regulate rate at which raw stock is fed into machine, altering weight of roving produced.
• May weigh rolls of fibrous web and be designated web sizer.