ST114C Circular Flour Test Sieve – National Standard Compliant Instrument for Flour and Grain Fineness Determination Description The ST114C Circular Flour Test Sieve is independently developed in accordance with the national standard GB/T 5507-2008 Inspection of Grain and Oils – Determination of Flour Fineness. It is a professional testing instrument for measuring the fineness of flour and grain materials. Featuring a rational structure, stable running, reliable performance,